After 2200 miles the exhaust tips get ugly. I took a chance and ordered Mothers Power Ball Mini and Mothers California Gold metal polish. I got rid of most of the grime with 00 steel wool and paint thinner. This step got them reasonable clean. Got out the Power Ball that was attached to my variable speed drill motor. The ball's size is perfect for the exhaust tips - I swear it was made for them! I was not aggressive with the speed or pressure - just wanted to see what the ball and polish would do. I like the results as noted by the before and after pictures.