I bought a used Tony Franklin fretless...well, after asking the seller, is the board clean, then being told it was, I bought it. Well, I get the bass and the board has wear from roundwound use. So I'm bummed, otherwise it is mint. Is there anyway to clean up the board? There are some deep marks, I thought I'd ask the board. If not I'll deal, but there are 2 spots that are just bad. Thanks for letting me vent.