Yes you can I tried almost everything then I found the thing that worked great. It is brakleen is what I used. I guess that any brake cleaner would work and it didnt hurt the windows a bit. I just wiped them with the brake cleaner well it took a little effort but not hard. Then I wiped them off with water to get the cleaner off. I already have 3 coats and it works great. Sorry for the post but I posted before I tried anything. Matt