Scrub refers to the credit card people declining sales by people trying to buy something. At times they may decline cards that at other times they may have approved. Say if they see a CC that has never been used online and is only used to by feminine hygiene products at the drug store that is located one block from the 40 year old lady who's card it is and suddenly they see eight memberships being bought at gay guy pay sites within one hour. Despite the fact that the card is good and not reported stolen the CC says something in up and declines it. During heavy scrubbing they may have declined the CC the first time it was used to buy porn but during light scrubbing they may have been able to buy all eight memberships.
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