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Discussion Starter #1
Anyone got any advice for a deep clean of a windscreen?

I've tried:

1. Washing with my regular shampoo (Autobrite Purple Velvet)
2. Angelwax Vision
3. Claying
4. Simoniz Bug/Tar remover

Tried deep cleaning and applying double coat of Angelwax H2Go, but always get pretty terrible results from the H2Go.. Lasts maybe a week, and I end up with a smeary crappy mess which I try and apply screen wash to clear but it ain't going....

Using Bosch Aerotwin wipers less than a year old.. Still nice and quiet and in good nick as far as I can see.....

I tried RainX about a year ago now and didn't really like it... I'm wondering if I've got some of that still bonded to the glass and I'm getting rubbish results since that....

So, any deep decontamination/stripping back to bare glass tips?
 

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I use RainX and it works. Use RainX as a clay lubricant for a proper clean up. It is generally so good that at speed I simply don't need the wipers.
 

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Discussion Starter #3
I use RainX and it works. Use RainX as a clay lubricant for a proper clean up. It is generally so good that at speed I simply don't need the wipers.
Yea I found RainX worked well enough for a day or two as well.... But again that finish diminished pretty quickly for me as well...
 

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I never did have a smeary screen, but the 159 has auto intermittent wipers that go absolutely crazy with a greasy windscreen. My first few months with the car I tried a variety of cleaners before finding what works. No doubt there are other solutions, but what worked for me was:
Just the once: a heavy-duty de-grease with white spirit. Then a polish with Turtle Wax Intensive Cream Glass Polish, which left the glass noticeably smoother to the touch. The next couple of car washes I followed with Tesco Glass Cleaner to remove any wax or detergent residue left on the screen, and the auto wipers gradually became more sensible.
About 6 weeks later I gave it one more go with the Glass Polish, and a squirt with the Glass Cleaner whenever the wipers became erratic, as well as after every wash.
Three months down the road the auto wipers are reliably well behaved, suggesting that the screen is now clean enough.

That works for me. If Turtle Wax and Tesco are not your style, no doubt your preferred brands could do as well if not better.
 

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For clearing away an 'unseen' residue on the screen I've used washing up liquid. In general I don't use screen polishes as in my view (pardon the pun) the benefit isn't there over and above general screen wash. Often it's residue left on the wiper blades which re contaminates the glass. I give the blades a good clean each time I wash the car.

It can be easy to get unwanted polish/wax onto the glass though. I had this issue recently when using AG Aquawax...some got on the screen and I didn't notice it....until it rained!
 

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Discussion Starter #7
For clearing away an 'unseen' residue on the screen I've used washing up liquid. In general I don't use screen polishes as in my view (pardon the pun) the benefit isn't there over and above general screen wash. Often it's residue left on the wiper blades which re contaminates the glass. I give the blades a good clean each time I wash the car.

It can be easy to get unwanted polish/wax onto the glass though. I had this issue recently when using AG Aquawax...some got on the screen and I didn't notice it....until it rained!
Screen wash ain't touching this stuff, just makes it look crappy and smeary!

I've made a point of cleaning the wiper blades the last few times I washed the car too.. Shampoo'd them down with the Purple Velvet, wiped clean with a microfibre, then used a microfibre damp with a spritz of Angelwax Vision too...

I've not used any liquid/spray waxes in a long time, only Fusso99, Autoglym HD, and some Cherry Glaze in the last 6 months.. 99% sure none of that went on the windscreen!
 

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Ive always used vinegar on my car windscreens and windows,also cleans windscreen wipers well too...

Just put some vinegar onto a cloth and pinch the windscreen wiper pulling the cloth along its length..
 

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Hi. Have you thought about cerium oxide? It's easily available and very effective as a glass polish. . It'll take around 90 minutes to do the job as you need to mask off the surrounding area. You use a polish pad on an electric drill with the cerium oxide paste. It worked wonders for me getting rid of an arc of small scratches caused by previous owner. It may sound a bit scary - going at your windscreen with an electric drill- but there are a few videos on YouTube that show how to do it.
 

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Neat washing up liquid in abundance does the trick, keep scrubbing away and removes all traces of grease road film etc. .
 

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Am I allowed to suggest methylated spirits and a scrunched-up ball of newspaper...? That's what I use on the inside, and I'm sure it works on the outside too.

I do occasionally use a glass cream polish on the outside to remove water spots. It works best in conjunction with white scouring pads supplied with the cream and intended for this application; DO NOT use any other type of scouring pad, as the usual green 3M type WILL scratch glass!

I've never been a fan of Rain-X on screens with wipers (eventually results in an annoying film of water being left behind by the wipers - disappears quickly but can be enough to confuse a rain sensor). Rain-X is great on side windows and mirrors, and rear windows that don't have a wiper, and helps to prevent the buildup of water spots in the future.

-Alex
 

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Am I allowed to suggest methylated spirits and a scrunched-up ball of newspaper...? That's what I use on the inside, and I'm sure it works on the outside too.
-Alex
newspaper no need for anything else and then clean wipers should work ok
 

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I would suggest stripping everything off the glass with some cerium oxide (as previously suggested) which would then allow you to see if it is the glass or something else i.e. wipers

CarPro sell a product called Ceriglass which also comes with a hand polishing rayon pad. This would be no good for correcting glass scratches but will remove almost anything from the windscreen
 

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Discussion Starter #14
Well I picked up a bottle of Autoglym Car Glass Polish from Halfrauds this evening.. Expecting a 5" Rayon glass pad in the post today/tomorrow too, so will go for a deeeeeeep clean of the screen tomorrow if the weather holds out!
 

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Well I picked up a bottle of Autoglym Car Glass Polish from Halfrauds this evening.. Expecting a 5" Rayon glass pad in the post today/tomorrow too, so will go for a deeeeeeep clean of the screen tomorrow if the weather holds out!
What machine are you using?
You need a rotary to effectively polish glass as DA's don't generate enough heat.
 

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Discussion Starter #16
What machine are you using?
You need a rotary to effectively polish glass as DA's don't generate enough heat.
Poorboys 900w DAS6 Pro, at your recommendation :thumbup:

The Autoglym polish recommends hand-application, I figured getting the machine polisher on it would only help the situation!

Pad didn't turn up in the end, so I hand jobbed it instead!
 

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It's a good machine but I've never used it to polish glass, I usually use my Makita rotary for that job. I'll give it a blast on the next available dry day to see if the extra 50w the PoorBoys machine has over most other Das6 Pro type machines makes a difference...
 

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Discussion Starter #18
It's a good machine but I've never used it to polish glass, I usually use my Makita rotary for that job. I'll give it a blast on the next available dry day to see if the extra 50w the PoorBoys machine has over most other Das6 Pro type machines makes a difference...
Given the application instructions for the AG glass polish, I'd be surprised if there's any real abrasives in there... Pretty much just apply to a clean screen with a microfibre or applicator in small overlapping circles, press harder on stubborn spots, allow to haze over, and buff off.... Can't for one second imagine that's actually polishing anything...

What's your glass polish/cleaner of choice?
 

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Instructions for Turtle Wax polish are exactly the same as quoted above for the Autoglym. I don't suppose it 'polishes' the glass in the abrasive sense, but it does seem to strip away most of the contamination. I say 'most of' because mine did need a second go before the auto-wipers worked ok, that is the smearing completely disappeared.
 

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Seriously, I am not getting this problem. Machine polishing with cerium oxide? Really? I got in the 155 today, screen hasn't been wiped for 3 weeks, the wipers cleared the glass perfectly. When I say RainX, I mean the combined cleaner and water disperser (trigger pack), not the thicker stuff in the squeeze bottle.
 
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