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When experts refer to "mold" regarding vinyl it is more likely to be what is known as mold release which is added to the pressing machine so that the vinyl can be taken from the press without sticking. It is difficult to remove if the vinyl is still too sticky when removed. It could, of course, be actual mold but that is a little easier to remove from vinyl. Return the lp to the seller in either case and try again.
Mark, Paul,I think this kind of noise is not from any contamination in the grooves, not from mold or grime, but a physical damage to the vinyl itself. I believe that the press was too hot, and like frying eggs in a pan that is way too hot, things stuck to the pan, so to speak. So when the record was pressed, the vinyl in the bass of the groove actually stuck to the plate, pulling some of the vinyl into the groove as it pulls way when the LP was released from the press. Now there is actually vinyl debree in the groove that is still part of the LP itself. It can't be cleaned away or worn away.Wayner