PCGS has a restoration service. Depending on the value of your coin, I'd let them do it. What type of coin, yr, grade guestimate, and worth is it? If it's worth more than $500, I'd let them do it. Under that, take a stab at it. I would try on a test coin first that is worth melt. Rinse in acetone and let air dry. Don't rub it at all.
FYI - some people like the "ugly" black oxidation. It shows age and lets people know the coin hasn't been touched in many years.
thank you for all your help. hopefully I will walk around the coin show and see ngc or anacs and get their opinions some of my coins that I need "cleaned" are silver eagles that were not stored in air tight containers. my most expensive coin is a 1883 cc ms ?? and I am thinking to get it graded
PCGS Restoration will not remove original toning simply to make a coin white.
PCGS Restoration will never add toning to a coin.
In cases where PCGS determines that removing toning is necessary and desirable and will not detract from the coin, it may be done. This type of toning may be the result of improper storage, interaction with corrosive materials, or a stain due to an accidental spill.
most of my coins are far below 500.00 I am not a big fan of "toning " but the gold and blue tone's do look nice. I will be going to a coin show this week end (orlando) and maybe pgcs will be there as well as others.