I washed my car today and noticed a very small paint chipped rust spot on the roof of my stang just behind the windshield. The spot is very small about the size of a grain of rice (lol) but I would like to touch it up. Is there any product that will remove the rust so that I can touch it up with the factory touch up paint. I do not want to apply the touch up paint over the rust. Anyone else encountered this? Any suggestions would be greatly appreciated. Thanks