adding
beading makes little magnifyers, and also causes spotting from hard water, and stuff in the water.
with car polishes, the FAD seems to go from excessive beading, to the reverse, with water skin breakers for sheening instead of beading.
I now use a "silicoln" type of car polish, what i WANT out of a polish, is it to protect And FALL OFF , like boat paint. if the top tiny skin of polish falls off when blasted with hot water, it makes cleaning the dirt off fast and easy.
Silicoln stuff (the many products you can find it in) seems to make a fine skin, encourages beading :-( and falls off easy.
that old wax stuff worked great for that, but it does yellow.
and almost every polish i have seen says "may reduce visibility on windows" but heck i put it on my windows anyways. a little ammonia and its all gone anyways.
that rainX stuff is certannly a thin oily coat.
all of the waxes will have a very light mist of that powdery stuff after time.
you know the stuff that you rubbed off to get a shine, so if you try that stuff, a day after you polish it (take it off) polish it again, to remove that thin film.