I took my car to a detailer to let him see my windows that have either hard water stains or acid rain etching today. I have tried things like Bon Ami, white vineager and you name it and nothing touched it, but his shop guy brought out some type of whitish grey pasty type liquid in aclear bottle... squirted a little on my TTop and just rubbed a little bit and then wiped it off and the stains were gone just like that... now he also tried some of the rear window and didnt do much but said with a buffer he could probably get it all off... my question is, does anyone have a clue as to what this stuff might have been? I would rather save myself the $165 and just do it myself... I would assume it had to be some type of gritty compound. And where might I find this stuff? PepBoys?

 

That question should have been asked to the person that used it. It could have been tooth paste!.
But if you T-tops are the lexan ones then you can buff them with a light compound and finish with a polish for use after compounds. You could even sand them a bit then buff.

 

Well its on every window, I even went to PepBoys and got 2 differant compounds and one was heavy and still it didnt put a dent in the crap.

 

I never tried it but maybe that stuff called CLR (calcium, lime, rust). it is suposed to remove stuff like that. Shower door cleaner?