Beachbum, I recently tried a product to remove some rub marks and rust stains that acetone would not touch. It worked very well and is called
FSR...Fiberglass Stain Remover by Davis.
I have found a product that makes a good, long-lasting chafe protector without staining the rubbing surface. It's called
Rescue Tape. I use clear for the chafe protection but it comes in many colors.