That whitish stuff that makes you think the window needs defrosting all the time? The stuff that is so hard to get off even with a good cleaner and even then the window is all streaky at night? I got it all off with no streaks. I wiped the window with a paper towel saturated with an equal mix of rubbing alcohol and white vinegar. I dried what was left (the alcohol evaporates quickly) with another paper towel. Fast, cheap, all clear, no streaks. It probably took me longer to type this than to clean the window. FWIW, I use that mix for all sorts of things from cleaning my glasses to preventing swimmer's ear.