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Other than a good cleaning, the only thing you can do is cut the comm. I would suggest you and several other people you know the pool your money and buy a lathe to share.
other then cleaning it (i think the best way is to use an eraser) just get u and your friends to put money in to buy one, or ask a guy at your track to use his, or u could see if your local hobby shop has one i would suggest just buying one try ebay!