TPG conservation of CuNi coinage

I have a rare coin which, despite spotting, is rather nice looking, so I plan to submit it to a TPG, as it is surely one of the better of the variety.
I'd like to be sure the spotting is stopped in its tracks before having the coin holdered. I have experience with the TPGs conserving gold, but not copper, nickel or silver. I'm not very concerned with trusting them to well-conserve silver without damaging it, but would like to know more before making any decisions about conserving copper or nickel, and especially nickel, in this case.
Therefore, I'm looking for feedback regarding short-term and long-term results from those who have had nickel coins conserved by either or both NGC & PCGS.
Can anyone chime in with their personal experiences?
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Comments
Quick edit . . . I'm looking to neutralize the spotting, not remove it. Importantly, there's some attractive wood grain toning on the obverse which I prefer not to surrender. If I must, I will . . . reluctantly.
Photos would help for the best responses.
Acknowledged . . . will try to shoot & post before Santa eats the cookies & drinks the milk.
Acetone would safely neutralize PVC without affecting toning. Not sure what caused your spot thought.
I don't see how to import photos from my local drive. All I see is the ability to import them from a web address. Hints anyone?
Click the picture icon, and click “choose files” then choose you photos presumably from your local computer C drive
It's all about what the people want...
Images below are of a 2 Feather 1915 Buffalo Nickel. Spotting is apparent at the back of the Indian's head, and above the bison's back.
Thank you.
Ill stick by my acetone assessment! Not sure if it will get all the black off and it might be etched underneath.
Not sure if thats a true 2 feather as some of the third feather is there.

Heres what the 2 feathers look like.
@ToughCOINS
Successful BST with ad4400, Kccoin, lablover, pointfivezero, koynekwest, jwitten, coin22lover, HalfDimeDude, erwindoc, jyzskowsi, COINS MAKE CENTS, AlanSki, BryceM
Acknowledged @gumby1234 , I have had numerous examples of the 2 feather, one of which looked like this and certified as such. Also, while I'm not sure where I saw it, someone else is offering a similar example as a "2 1/2 feather", and claiming it to be more rare . . . I'm not sure I want to go there.
@ToughCOINS I currently have a modern clad ( nickel/copper ) coin in getting conserved. It is my first coin conservation. Haven't gotten thru the grading process with it yet. Don't know when its going to be finished, but it apparently made it thru conservation. Good Luck with your nickel. Curious as to why you don't want the spots removed thou?
Successful BST with ad4400, Kccoin, lablover, pointfivezero, koynekwest, jwitten, coin22lover, HalfDimeDude, erwindoc, jyzskowsi, COINS MAKE CENTS, AlanSki, BryceM
Whenever I’ve seen straight-graded coins with spots, I’ve thought they looked much less messed up than coins from which spots had been removed. I think it’s probably better to neutralize the spots, and not mess with the coin’s virgin surfaces than to remove them.
Good luck with your conservation effort.... Some of those spots (above the top feather for example) look green... could be PVC... Why not try a good acetone bath (several changes with agitation) before submitting. Of course, the TPG's have professionals, so if you are not comfortable with your own methods, by all means submit. Let us know what results you get. Cheers, RickO
Don't waste your money on conservation services. Those dark, so-called carbon spots can't be removed without damage to the coin and you can easily remove the PVC contamination yourself using acetone as others have suggested.
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"Paper money eventually returns to its intrinsic value---zero."----Voltaire
"Everything you say should be true, but not everything true should be said."----Voltaire
Cool coin even with the carbon spots the PVC will come off. 👍
Hoard the keys.