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I've heard lots of people just use the aerosol oil spray stuff that you use to keep cakes from sticking to pans when you bake them. Just wash it off when you're done with it.
it sounds like a sales gimmick. just keep a good wax or sealant on your paint and bugs will come off with ease during a normal wash. also, the squirter fluid they have for sale there will take the "rain X" off your windshield and you won't get that beading effect anymore. i prefer to use optimum optiseal instead of rainX. lasts longer, beads better and applies easier