Requesting ideas for removing sticker residue from copper coin

[SilverAge3]

Any opinions how to clean this sticker/tape residue off of a copper coin?  Cartwheel Twopence.

It is graded as AU details tape residue, I plan to crack it from the slab and remove the gunk, if feasible.

Sticker looks like a tenaciously tacky price sticker, which did not fully come off. Thanks to some clueless antiques dealer or estate sale, is my best guess. Stranger still, was it getting graded in this state.

I have a few ideas for removal, but posting around various places to see what ideas and insights other people may have.

Copper is much tricker than silver, it is quite reactive. It may take short durations of acetone, but no long soaks, which would be easy and useful for silver.

I am leaning toward Hoppes #9 Gun Bore Cleaner, maybe quick passes with acetone, rinsed with RO water, blotted dry.
 

Edited 5 hours ago by SilverAge3

[Coinery]

I simply cannot believe that a) someone submitted that for grading with sticky tape attached and b) that a grading company actually slabbed it along with the tape and graded it as ‘details!’

I personally wouldn’t be afraid at all of giving that a clean with as much acetone as is needed. Apply it with a Q-tip.
You may have yourself a bargain there! 

[Paddy]

I see no reason not to start with just warm soapy water. Most sticky labels use water based glue.

If that does not work, my next try would be alcohol - rubbing alcohol I believe it is called in the US, surgical spirit in the UK.

Only if both those failed would I move on to Acetone.