Car Windshield film.
 

Don't tell me ammonia glass cleaner. Anyone use glass 'polish'?

Vinegar for hardwater and oil film?

50/50 white vinegar and water

the first time you use it though you'll want to add just a little bit of dish soap to remove the old residue though

heard baking soda too.

Soak the entire car with brake fluid.

I suggest a little Hydrogen Flouride. :fire:

Bon Ami.

Anti Freeze, you don't need the bowl for this application.