I have found most off the shelf screenwash even in concentrate form noit suitable for anything below -5. Halfords concentrated screenwash is too thick and can leave a sticky residue and block up your nozzles.
I have some screenwash in neat form in the garage and there are ice crystals in it. Those will give the appearance of frozen wash water. The meths lowers the freezing point of the water due to it being 97% ethanol and 3% Methanol, so in essence pure alcohol.
I have heated washer jets, and even those have frozen recently to which is the reason to why I went to meths.
does nail polish remover work? lol (think thats pure ethanol
dont think i can get meth anywhere here.