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I use to wash them in soapy warm water, but it only seemed to work a few times, and now they're pretty much covered in the stuff... They still seem to do the job, just not as well when they were brand new.
My Flexi's are pretty much caked too, but i might try using an eraser on them, or a bit of putty rubber, though they are well used now (wears away a bit like, but not as severe as sand paper)... Come to think of it, a scouring pad may do the trick when it comes to diamond coated files.
My Flexi's are pretty much caked too, but i might try using an eraser on them, or a bit of putty rubber, though they are well used now (wears away a bit like, but not as severe as sand paper)... Come to think of it, a scouring pad may do the trick when it comes to diamond coated files.