it take it it is on the outside??? its called acid rain dont know why its called that but hey, i use 3m rubbing compound and window cleaner,so spray the window cleaner on the window then get the rubbing coumpound and rub it in like your polishing the window, make sure the window is always wet otherwise it will scratch the window and dont get it on the panels, then spray the window cleaner back on the clean it off, get an air compressor and blow of all the left over rubbing compound off. hope this helps