They sell a small fiberglass brush that can be used to sand down the rust. I got mine at Pep boys I think. Let me see if I can find a pic or link. It's about the size of a pencil. (Think of a pencil eraser pencil filled with a fiberglass brush, that can be extended as it wears down). I can't seem to find a link. I can take a pic of mine, but I am not sure how to post it here. Griots has something like it # 50310,50303a