that happened to me to, my new shift pants were rubbing on the zorst an i smelt something burning i looked down an my pants had burn holes every were lol
i tried to get it off but nothing worked i didnt try steal wool cause it might of scratched it up
i got some off buy after going for a ride an the zorst was hot i got a rag an rubbed hard an some of it came off cause the heat made it soft to rub off
so give that a try