I would get the meguiars "deep crystal" system. Ive used it on both my civic, and now my 4runner and the paint always looks almost brand new. Get 3 steps: the paint cleaner, paint polish, and carnuba wax. Oh and expect it to take almost all day too. I do it all by hand, no buffer, so yeah it takes longer, but it comes out good. For deep scratches or problems, use meguiars scratch-x. it kicks ass! other than that, if those products dont get it out, it would be best to take it to a professional and have them buff it out. They have many grades of polish that they use with their buffer so it comes out better than what we can do at home. plus if they screw it up, its all on them!