ack no no no!
cleeeeaaan them. mine were covered with burnt rubber and i was going to grind it off, rendering them useless. however there is a solution you can dip them in to make the rubber fall right off. brake cleaner or something related to castrol super clean. ill try to find out soon. actually im not sure if i can. i just asked the guy that did it and he said he doesnt know. try various things.
replacing them should be a last resort. im sure they are still round and probably spin. if not, replace them.
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