WOW! I was not really confident these would work like advertised but they do! The first thing i used 1 on was the window my dogs always look out of. It always has dog nose smudges, and if you have dogs you know their nose snot dries like glue on a window. In the past, I have had to use dawn powerwash to clean it and then follow that up with glass cleaner. This time just this magic rag did the whole job in no time! I am sold!