Offered here is a 1816 Large Cent, a Coin that I attributed a Newcomb 2 variety. I sent this coin to PCGS, and they diagnosed an old cleaning and assigned an Extra Fine grade in detail. A strong XF grade, but cleaned.
I could not bring myself to do that. But, if you want to try this, take the coin out, place it on a sunny window sill for a while.
The result will be a slow return to a more brown copper state.