Diary Of An ADI

A Driving Instructor's Blog

Putin boasts his IQWhat else is there to say?

Vladimir Putin is a fu**ing w**ker!

I’ve tried to give him the benefit of the doubt all these years. But now, all doubt is removed. And he is a fu**ing w**ker!

Share

DVSA LogoDVSA has just sent out an email alert advising that all driving and riding tests at certain test centres are cancelled due to Storm Eunice.

It’s a long list, mainly involving test centres in the south of the UK. Centres involved currently are Ashford Kent, Ashford Middlesex, Aylesbury, Banbury, Barking, Barnet, Barnstaple, Basildon, Basingstoke, Belvedere, Bishops Stortford, Bletchley, Bodmin, Borehamwood, Brentwood, Bristol (Kingswood) MPTC, Bristol Avonmouth, Bromley, Burgess Hill, Bury St Edmunds, Cambourne DTC & LGV, Cambridge, Cambridge (Hardwick), Canterbury, Cardington (Bedford), Chelmsford (Hanbury Road) GVTS, Chertsey, Chichester, Chingford, Clacton-on-Sea, Colchester, Crawley, Croydon, Culham LGV, Eastbourne, Enfield LGV, Enfield MPTC, Erith, Farnborough, Folkestone, Gillingham GVTS, Gillingham MPTC, Goodmayes, Greenford, Greenham LGV, Guildford, Hastings, Hendon, Herne Bay, High Wycombe, Hither Green, Hornchurch, Ipswich, Isle of Scilly, Isleworth, Lancing, Launceston, Lee On The Solent, Leighton Buzzard Car/LGV, Letchworth, Loughton, Lowestoft, Luton, Maidstone, Mainstream (Kent), Mill Hill, Mitcham, Morden, National Driving Centre (NDC), Newbury (Hambridge GVTS), Newport(Isle Of Wight), Norwich MPTC, Oxford (Cowley), Penzance, Pinner, Poole GVTS, Portsmouth, Reading, Redhill, Rookley LGV, Salisbury, Sevenoaks, Sidcup, Slough, Southall, Southampton (Forest Hills), Southampton (Maybush), Southampton LGV, Southend, St Albans, Stevenage, Swindon LGV, Swindon, Thurrock, Tilbury, Tolworth, Tottenham, Trainfor (Kent), Tunbridge Wells, Uxbridge, Wanstead, Watford, West Wickham, Weston-Super-Mare, Winchester DTC, Wood Green, Yeading.

New tests dates will be booked automatically if you are affected.

Share

dvsaThis is interesting. DVSA has announced that it will be trialling carrying out the reverse bay park exercise in non-DVSA car parks during February and March 2022.

The trials will be conducted in Stafford, Newcastle-under-Lyme, Barnsley, Wakefield, Chester, Northwich, Upton, Wallasey, St Helens, Wolverhampton, Gillingham, Bishopbriggs, Gateshead, Durham, and Abergavenny.

I’m all for it – especially if it stops those twats who think they’re good ADIs, and yet who see the test centre car park as some magical place that their little darlings must practice in at all costs. Even when tests are coming and going, and when they have expressly been asked not to.

The first time any of my pupils get to bay park in the test centre car park is on the day of their test. Once when we turn up, and perhaps a second go if they get that manoeuvre once their test commences. The rest of the time I use business and retail parks, or supermarket car parks.

The sooner DVSA implements this fully, the better. But I bet you some instructors will be opposed to it.

Slide
Slide
Slide
Slide
Slide
Slide
previous arrow
next arrow

Share

Smearing windscreen in rain

The problem of smeared windscreens in the rain has driven me nuts ever since I started driving, but it became a major headache when I became a driving instructor.

We’ve all experienced it. You get a few spots of rain, and when the wipers wipe you get a mosaic pattern left behind for a few seconds. In heavy rain it’s like someone poured chip fat on the screen and you can’t see properly.

Just to clarify, but there are two separate situations involved here. The normal everyday situation is that muck gets on to your windscreen, and you need to get it off. You do that by squirting some of your screen wash on to the glass, and the wipers wipe the muck away. I’ve talked about how to do that in the article about making your own screen wash. However, over time you get oil and wax bound to the screen which is very difficult to get off, and that is the second situation, and the subject of his article.

Things came to a head some years ago when my lease company replaced my car. From the first day I owned it, in rain you couldn’t see anything. All the previously tried methods, which had given various levels of success, failed completely. Scrunched up newspaper was no good, sodium lauryl sulphate had a minor effect, various solvents also minor, and Clearalex was probably the best but still far from perfect.

The problem was so bad that I seriously thought that the glass must have been damaged in some way.

Normal smearing is caused by gunk on the road loosely binding to the glass. All you need is a bit of water and detergent and it comes straight off. But wax is a totally different matter. A tiny amount of it can affect the entire surface of the glass, and is does not come off with normal detergents. In fact, the process of washing the car can be a major culprit – sponges and rags get wax on them from any waxing process you use, and if you go near the glass with them it gets on there, too. It’s even worse if you use hand car washes regularly (as I do).

The other thing to remember is that your wiper blades can also get wax on them. Even if you get your glass sparkling clean, a few wipes of contaminated blades can mess it up again almost immediately. Furthermore, if you clean the glass and the blades, but leave any wax in the well where the wipers sit, they pick it up and spread it around again.

That lease car – and several others since – appears to have had some manufacturing residue still on the glass, because I was also having problem inside with misting and hazy marks with certain sun angles.

So how can you get it off?

Clearalex is available as a liquid, but you used to be able to buy it in sachets in powder form. It is intended to be added to your screen wash, and it cleans quite well, but the drawback is that it leaves a horrible white residue when it dries. I have had some success with Sodium Lauryl Sulphate (SLS), which is an anionic surfactant used in many household products. It removes quite a lot of windscreen gunk, but it didn’t seem to touch wax or my residue, and it also leaves annoying white marks on the glass when it dries.

However, I eventually came across Sugar Soap. I’d not heard about it before, but it is used by decorators and builders to remove grease and dirt from surfaces prior to painting, and it occurred to me that that was precisely what I was trying to achieve with my apparently permanently gunked windscreen.

Wikipedia describes it thus:

Sugar soap as typically found in Commonwealth countries is a cleaning material of variable composition sold for use on surfaces affected by greasy or tarry deposits which are not easily removed with routine domestic cleaning materials. When in dry powder form it looks like table sugar thus causing the name.

The solution is alkaline and its uses include cleaning paintwork in preparation for repainting.

The powder form looks exactly like Clearalex powder, and I suspect that there may be some similarities in chemical composition. But you can get liquid and trigger spray variants of it. The main difference between Clearalex and sugar soap is that the latter is dirt cheap, whereas the former comes at a premium price. You simply make up a bucket of the stuff with warm water and give your windscreen a good going over with a clean rag or sponge.

In the case of my ‘damaged’ windscreen, I soaked some cloths in the solution and gave my windscreen a good scrub. Then I then took the car out for a run in the rain.

Initially, I thought it hadn’t worked. But with each wiper pass the glass was became clearer and clearer. The sugar soap appeared to have softened whatever it was on the glass and it was gradually coming off. When I got back home I soaked the rags again and this time left them covering the windscreen for about half an hour (not forgetting the bit under the wipers). I also cleaned the blades with it. This time the windscreen was absolutely crystal clear.

In conclusion, Sugar Soap is great for one-off cleaning. However, it leaves a nasty  white residue when it dries if you try to include it in normal screen wash.

Traffic Film Remover (TFR)

Not long after all this, I stopped using the Tiger Wash (drive thru) at my local garage and started using a local hand car wash – partly as a result of the garage hiking fuel prices, and partly because the hand car wash also did a damned good vacuum clean of the inside of the car. I was intrigued at how clean they could get the car just using some small hand pumps and a power spray. The next time I was in, I did a bit of snooping around and discovered ‘TFR’ – or ‘traffic film remover’.

After reading up on the subject, I bought some TFR from a company called JennyChem. If you use the code BAYJC8628 you will get a discount. They also supply the mysterious cherry-smelling shampoo the hand car washes use, along with a range of other treatments used by car washes. In a nutshell, a 1-2% TFR solution gets all the oil/wax film off a windscreen in one go, and it also seems to also attack the residue I’d been plagued with on my lease cars since that first one that had it, though sugar soap is still best for this.

Right now, you can get a 5% discount at JennyChem using the following code at checkout.

BAYJC8628

I use TFR in a small spray bottle to clean my alloys and bodywork in between visits to the hand car wash when I have an upcoming test. It removes brake dust from alloys, as well as summer tree gum and bird crap (especially when the little sods have been eating blackberries and insist on sitting on the telephone wire right above my driveway).

And a final note. You can make your own screenwash using TFR. But be advised this does still leave a slight residue.

Does TFR damage the windscreen?

No.

Does TFR damage paintwork?

If it is the non-caustic type, and if it is used at the manufacturer’s recommended concentration, no. But remember that TFR will remove any wax you have applied, so you will need to re-wax after using it on painted surfaces. However, removing wax is exactly what you want if it’s on your windows, which is ultimately why I use it.

Strongly caustic types – which are cheaper and harsher, and often used to shift several centimetres of crap off the undersides of lorries – could damage painted surfaces if used at high strengths and if left on for too long. However, the stuff supplied by JennyChem is not strongly caustic, and is specifically designed for use on cars.

Is there a non-chemical solution?

A reader (from Australia) wrote to me to tell me that he had had success removing that new-windscreen film using Cerium Oxide paste. You can buy it easily from various places (including Amazon) in various forms – powder, paste, or block – and it is specifically used for polishing glass. If you buy it, make sure you get the finest grade possible – ideally, one which is specifically sold for the intended purpose.

Can you put oil on the windscreen to prevent smearing?

Or, as it was put to find the blog, ‘can u put oil on wind screen 2 prfent rain’? NO. It will make it worse.

My windscreen is smearing when it snows

That’s probably a different thing, and not ‘smearing’ at all. When the windscreen wiper rubbers get cold, they also get stiff. As a result, instead of flexing to the windscreen contours and bending forwards and backwards on each stroke of the wiper, they snag and bounce across. They may even not touch parts of the screen properly on the wipe. All of this is often accompanied by a horrible grunting sound, and it leaves behind a trail of water streaks.

Also, if there are remnants of snow on the blades, this can leave a trail of melt water as the blades wipe. You get similar effects if a leaf or small piece of blossom gets stuck on your blades.

I see rain spots after my wipers wipe

Then you’ve got wax or some other coating on your screen. I get it after I’ve been to the car wash, and I remove it using TFR and/or sugar soap.

Don’t forget that the wiper blades must also be cleaned (as well as the space below the blades when they are in their parked position). There’s no point cleaning the glass of wax if the rubber still has it on it. The wipers will put the wax back as soon as you use them.

Slide
Slide
Slide
Slide
Slide
previous arrow
next arrow
Share

Smearing windscreen in rainI’ve mentioned this in the smearing windscreens article, but winter is the time of year where it gets wet and cold (well, certainly wet), and along with the salt spreading a lot of crap gets thrown on to your glass and builds up into a nasty film that doesn’t easily wash off.

I’m always surprised that some people – including driving instructors – only put water in their wash bottles. And they try to justify it! But water on its own simply does not have sufficient wetting properties to attack oil, wax, and grease stuck on the glass. You know when it’s there, because you get that mosaic pattern left behind when you wipe in the wet.

You need a good detergent to clean off oily deposits, and a small amount of alcohol to assist with wetting. Alcohol also functions as an antifreeze when present in higher quantities, so whereas water will freeze at 0°C, a proper screen wash solution containing alcohol will freeze at a lower temperature depending on how you mix it – as low as -9°C.

You can buy two types in the stores – concentrated, or ready-to-use. With the former, you dilute it yourself depending on the weather outside, and with the latter you have to buy the correct type (they do ‘summer’ and ‘winter’ mixes, with the summer one containing very little alcohol). In most cases, the ‘concentrated’ stuff can be used neat and will protect to between -6°C  and -9°C depending on the brand. Some types claim as low as -20°C, but these are specialist ones and they likely contain other chemicals, since alcohol alone to provide that level of freeze protection would be quite dangerous because of its flammability.

The price of typical concentrated screen wash varies from about £5 per 5L in summer, to about £8 in winter (when you need it the most). The ready-to-use stuff is similarly priced, even though it is more dilute – so you are paying for water if you buy that. In a bad winter, with lots of rain and slush, I can easily get through 5L of washer fluid each week. I use less in summer, but over a year it can still mount up.

If you’re going to buy it, my advice is to stock up in summer when the prices are lower, and only get the concentrate so you’re not paying someone to dilute it for you. You often get BOGOF offers in summer.

However, it can be cheaper to make your own, and it is certainly more convenient. I got the idea when I had a freeze up one time (I was late switching to my winter mix in the first of the two cold winters we had about ten years ago), and solved the immediate problem by nipping into a hardware store and buying a bottle of methylated spirits. Adding that to my wash bottle depressed the freezing point and I was running again within 30 minutes. So then I thought why not make my own?

Washer fluid essentially needs to do two things:

  • clean
  • not freeze when it gets cold

It’s basically just a mixture of alcohol and water with a bit of detergent. And some smelly stuff and dye if you are going the whole hog with it.

For a normal screen wash, the recipe below is what I now use. In a 5L bottle, I place the following:

  • 10g Alcohol Ethoxylate
  • 50g Butyl Glycol
  • Ethanol
  • Fragrance
  • Colouring
  • Water to make up to 5L

The amount of Ethanol depends on the temperature you want to protect down to. To protect to around -2°C, 250mls of Ethanol is all you need (this is my Summer mix, since Ethanol also acts as a wetting agent and it helps to get rid of tree sap). To protect to -4°C, you need 500mls of Ethanol, 750mls protects down to around -6°C to -7°C, and 1L protects down to -9°C. Any more Ethanol in the mixture than that and the solution (especially its vapour) becomes potentially highly flammable. I adjust the amount depending on how cold it is, but I switch to at least 500mls around November each year.

Surprisingly, the water you use is quite important. Tap water is likely to leave water marks on the glass when it dries because of the dissolved salts in it. For many years, I used boiled rainwater, but these days I use the condensate from a home dehumidifier.

I buy Alcohol Ethoxylate and Butyl Glycol from Mistral Industrial Chemicals. At the time of this update, 1L of Alcohol Ethoxylate costs £15 and 1L of Butyl Glycol costs £16.99. The total value of these in each 5L batch of my screen wash is therefore just under 16p.

Ethanol is the most expensive ingredient. I currently buy mine from Liquipak. To keep the overall cost down, I buy 20L at a time, so a batch of my screen wash set to protect me to -9°C would contain Ethanol to the value of £4. A Summer mix would contain about £1’s worth.

I latched on to Alcohol Ethoxylate and Butyl Glycol from reading the Safety Data Sheets from various manufacturers of commercial solutions, and worked out a recipe from there.

A brief aside…

Some years ago I was having major problems cleaning my windscreen on new lease vehicles when I received them. There was something on them that gave the mosaic effect in the wet, but absolutely nothing would get it off.

Eventually, I found that Sugar Soap would. Sugar Soap is used by builders and decorators for degreasing walls and paintwork before painting, and I found it did remove the stubborn film from my windscreens.

Then, a few years ago, I was snooping around the forecourt while my car was being valeted at a hand car wash. I was intrigued by all the things they sprayed on the car which got it sparkling clean, so I wanted to find out what they were using. This was when I discovered Traffic Film Remover (TFR).

I tried using Sugar Soap in my screen wash, but it left a heavy residue when it dried. For several years I used TFR, which was much better (and very effective), but it still left streaks when it dried which I wasn’t happy with. This is why I came up with this latest recipe.

However, if your windscreen picks up a lot of wax from car washes, and other residues from the road, screen wash alone won’t completely remove it. In fact, you can completely degrease your windscreen in the visible areas, but it you leave even a trace of wax on the wiper blades or – worse – in the space where they sit when they aren’t wiping (it gets pushed down there and acts as an ink well), it gets spread pretty quickly back on to the main area of the glass.

An occasional deep clean using Sugar Soap or TFR is still a good idea, therefore. You can get Sugar Soap on Amazon, or at the local Screwfix depots and such like. You can get TFR (among other places, including Amazon) from JennyChem. And if you do decide to order directly from JennyChem, use the discount code BAYJC8628 to get 5% off.

Slide
Slide
Slide
Slide
Slide
previous arrow
next arrow
Alcohol Ethoxylate and Butyl Glycol are the same agents used in commercial screen washes. They are relatively non-foaming, and are designed to attack the kind of stuff you get thrown up on to your glass while you are driving. Don’t try using Fairy Liquid or other household detergents – you’ll have bubble blowing down the street, and it doesn’t work for this purpose anyway at the concentrations it is intended to be used at.

Personally, I make my screen wash fluid ready-to-use as I need it (I make three or four batches at a time and just keep them on hand, making more as required). In summer, I use the minimum amount of Ethanol, and in Winter I just up it depending on how cold it is outside based on those freezing points I mentioned earlier.

As for the fragrance, I found a concentrated Apple scent specifically for car detailing applications like this. It is manufactured by Koch Chemie in Germany, and is called Duftstoff Apfel. If anyone wants to know where to buy it, drop me a line using the Contact Form. And the colouring I use is just three drops of food dye.

How can I prepare for cold temperatures?

Use common sense. If it’s warm, you don’t need a low-temperature screen wash mix, since the higher alcohol content is just a waste of money. But you do still need decent cleaning power for the bugs and tree sap you’re going to get. However, if it gets very cold, you don’t want a freeze-up, so be ready to alter your mix accordingly.

For the recipe I have given here, assuming you have made it to protect down to -6°C to -7°C (750mls Ethanol), you can dilute it 1:1 or 1:2 with water and it will still clean your windscreen. As I say, I make mine as I need it, so I always have the full detergent effect.

Can I make it with more alcohol in it?

Yes, but be careful. Ethanol is flammable, even in water mixtures. On its own, Ethanol has a flash point of 14°C (that means that at that temperature and above, a combustible vapour exists above it that can easily be ignited). A 10% solution in water has a flash point of 49°C, which is much safer. A 20% solution has a flash point of 36°C, which is still safe unless you store it in a very hot place. A 30% solution has a flash point of 29°C, and this is quite likely to be encountered in hot weather. My advice is not to exceed about 20-25% of ethanol.

Do not carry a strong Winter mix in your car in Summer. And definitely do not carry significant quantities of neat Ethanol at any time.

Can I use isopropanol instead?

Also known a Propan-2-ol, 2-Propanol, and Isopropyl Alcohol (IPA).

Short answer, yes – but only if the it’s a few degrees below zero. IPA has a lower flash point than ethanol, and any solution above 20% is potentially risky. IPA also has a very distinctive smell.

Can I use Methanol?

I’m just going to say no. It’s poisonous even in small quantities (it can make you go blind), and could be dangerous if inhaled regularly, so for that reason you should not use it.

Can I use methylated spirits?

Usually, this contains methanol as the denaturant – though sometimes other chemicals are used. It also has a strong smell. Apart from the time I used it in an emergency, I would advise against it. However, if you can find ‘denatured ethanol’ or ‘denatured ethyl alcohol’, and can be sure it doesn’t have methanol in it, that would be fine. It’s usually (not always) the blue stuff that contains methanol.

Can I just use water?

Water on its own is no good. If the temperature falls, it will freeze. Even if it doesn’t freeze in your main washer bottle, it will in the pipes and at the nozzles, and freezing water is quite capable of splitting pipes or closed containers. Attempting to use your screen washer pump if there is no liquid water inside could burn out the motor.

Water alone doesn’t clean many things off the glass – it won’t touch oil, grease, or squashed insects, and it will struggle with tree sap.

Remember that if you are driving without the ability to keep your windscreen clear, you are committing an offence. The Road Vehicles (Construction and Use) Regulations 1986 says:

Every wiper and washer fitted in accordance with this regulation shall at all times while a vehicle is being used on a road be maintained in efficient working order and be properly adjusted.

Arguably, you are not complying with this if you just use water. If it freezes (or the bottle is empty) and you drive, you’re definitely not complying with it. It is shocking that some ADIs are apparently doing this.

Can you dilute ready to use screenwash?

Of course you can – certainly in Summer. It’s not a magic potion – just a mixture of water, alcohol, and detergent. I wouldn’t dilute the ready-to-use stuff more than about 50:50 with water, though, because the detergent probably wouldn’t do its job properly.

Share
TES
JC TFR Mousse
Roadcraft
JC TFR Caustic
ADI Handbook
JC Snowfoam
ADI Skills
JC Tyre Shine
Fast Glass
Sugar Soap
Maxicrop Iron
MiracleGro Azalea
Doff Azalea Bulk
Doff Azalea Bulk