- Get some WHITE Vinegar. It must be white vinegar [This is the first wind-up: even white vinegar doesn't have white vinegar on the label. Plus, it's not white, it's clear.
- Mix with water [why?, water freezes] to the ratio of three parts vinegar and one part water. [This is the second wind-up: What does all that mean?]
- Decant the solution into a spray bottle [Wind-up number three: Who has a spray bottle? What is a spray bottle?].
- Spray the mixture on the windscreen in the evening before the ice comes: In the morning you will have a windscreen entirely free from ice.
The Brucie Bonus is your friend's car, in addition to being iced up, will smell like a chip shop.