Do NOT bother using regular "ready to use" screenwash for sub-zero weather...

[Ponders]

...or if you do, best add a slug of vodka...

I am - have just been messing about with random left-over bits in different bottles to make up enough for DH to put in his car & discovered that both Tesco & Holts ready-to-use are only good down to -2.

What use is that, FFS? Water should work down to almost 0!!! No wonder all our washers have been frozen solid! It's been quite mild here all day but some Tesco stuff which was in the shed is still half ice.

I did find one bottle from Lidl & that is good for -20 diluted 1:1 with water, or -10 diluted 1:2, so you should all rush out & stock up on that next time it's on sale

Ik now it is a bit late, for this year at least, but do not use to much of the stuff either as it clogs the jets if you do!