On the BBC on Friday, an AA man suggested putting meths in the screenwash to keep your windscreen clear, is this a good idea?

Yes, sure. That's what's in screen wash to stop it freezing. However, unless you have a 'special' supply its cheaper to just buy screenwash which is typically about 50% meths, 50% water and a touch of detergent (concentrated) the 'ready mixed' stuff has less meths and more water in it.

_________________
Mike

Cheers Mike, I'll buy some and drink my meths as usual!`

Look out for the levels of protection, when you buy concentrate you can mix to suit the current conditions.

I have a supply of VAG stuff, can be used 1:1 giving a ridiculous freezing point of about minus 25C

The ready mixed stuff is mostly water as said, and an expensive way too buy it i'd say.

_________________
Why isn't the number 11 pronounced onety one?

Yes, if it is all you have. No technical reason(Meths is actually VERY effective) against it but works out more expensive that "puka" screenwash. I have used it in the past.

cheers!