Wide A M 1998 question

I just found a 1998 wide A M cent in while cherrypicking . The coin looks great except for one black spot on the reverse any ideas on how to remove the spot without hurting the luster ?
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Go BIG or GO HOME. ©Bill
I have had the largest "hoard" of these that I am aware of and also submitted the only five MSRD 67's pcgs has ever graded. I also was the first to get the designation from them, even though I had to send them back to get it!
Why am I telling you this? I have a number of examples that are similar to the one you are describing and even sent one to NCS to be conserved--they could not remove the spot!
Therefore, welcome to the club(of having a great coin with spots and not being able to do anything about it)......you could probably get a 63 or 64 on the coin, if everything else is OK.
I have tried MS 70 myself on some of my lesser coins, along with every conccoction I can think of and nothing is satisfactory!