My Taylor Made Super Guard fenders are a good 10 years old, I do a decent amount of rafting up during the season and this year they started leaving marks on my boat and the boats I was tied up to. I'll confess to not cleaning them all that religiously. I called Taylor Made and they said to clean them with mineral spirits - holy cow what a difference! Took a little elbow grease but day and night change. They are still a bit banged & scratched up, but they have their shine back and no longer feel tacky - even the black ends came back (they had looked a little whitish). Just thought I'd pass that along.