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Thanks for the awesome replies mates. Since most have mentioned, I 'm trying to use the vinegar first. The thing is will it eat the glass?
Wouldn't have thought so - it's the main ingredient in cheapo window cleaners, so should be fine. If you're worried, just try it on a small area first, see what happens :thumb:

It should react with the scale from the watermarks anyway, so that will neutralise it (or you use a lot of vinegar, reduce the overall acidity).
 
Vinegar will be perfectly safe!

Bar Keepers Friend is an excellent for cleaning glass as well. Also, like vinegar, it is an acidic product.
 
As before, don't worry about acids. If you read Mike Philips, you are more likely do damage paint with ipa than with barkeepers.

Incidentally, barkeepers is very similar in chemistry to AS fallout remover - so quite safe.
 
I think I'm going to try some bar keepers friend on my glass which option is best powder form or cream,cheers
Powder is more concentrated and has more bite, i think.

Don't try to put the powder onto the glass as it will go everywhere, but try this method, which works well for me :

Lift the windscreen wipers and have a hosepipe ready.

Get a cheap yellow car sponge - get it nice and damp - then sprinkle a little of the powder onto the sponge and let it get damp for a few seconds.

Then you can move it over the car onto the windscreen area and carefully turn it over and work the powder around the glass. Just go slow and carefully work the whole windscreen with a little pressure.

When you are done, turn the sponge back over and lift it away from the car.

Then use a gentle hosepipe mist or stream to wash the BKF down the windscreen and into the rain channels and away. Use plenty of water to rinse out the rain channels afterwards to make sure it is all flushed off the car.

Worth the effort as it is absolutely epic at getting stubborn stains off glass.
 
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