well, I have had the stillen exhaust on my car for over a year now. It has the 4 inch tip on it and it gets all of the exhaust crap all over it and it looks like crap. well, I have tried everything with no avail until today. I finally got enough balls to go to the hardware store and get some 0000 steel wool and try to use it. get to the hardware store and my first impression is that it is not rough enough to take anything off and the one up will scratch the crap out of it, but it is only like $3 so I buy it and bring it home. so, I am sitting behind my car and it is starting to come up a little bit, so I get a little lube (spit) on the wool and start rubbing back and forth and then side to side and easilly within ten miniutes my tip looks bran new with no complaints and I even went in about 1/2" in so when people walk by and stare at Black Beauty (name of my car me and the ex named her) they are like, "man, new exhaust, wait a sec, all of the hangers and part of the muffler is rusted, we've been tricked"