I purchased a PCGS certified MS66 1942-S some time ago. Full disclosure it had spotty toning when I purchased it. Would this be a candidate to send to NGC to clean and certify? I appreciate any help on this.
Some people actually like that "mottled" look. How do the colors pop when swirled around in the light, or held to an angle? If you got some nice colors, why not sell it off at a premium and buy a blast white example you prefer? It would be interesting too see what NGC would do with it, so if you go down the route, make sure you post before and after shots to show how good/bad it came out.
Like @geekpryde said, some people like the mottled look. (I am not one of them.) I don't think it would be worth the hassle and expense of doctoring, even professional doctoring. Sell it to someone who'll appreciate it for what it is, and buy another that appeals to you more.
I would send it in and then use it as a kind of guide for future submissions. It should be worth keeping once in a slab. I guess it depends on what you plan to do with it in the future.
You could send it to NCS and then NGC to have them dip and grade it, but honestly it isn't worth it. If you thought it would get 67, I would recommend it - but that is highly unlikely. The cost of submitting it again would probably not be worth it. I concur with the other opinions - some people like this look. I would sell this one and buy a blast white one, if that is what you prefer.
I like coins as they are in their natural state regardless of the toning mottled or otherwise, once its been conserved (cleaned/doctored) I would consider it damage and avoid the purchase that is if I were able to find the history or if that information is available for discovery. Once it's graded leave it at that, part of numismatics is history and you can't change it so why try to change it on your coins.
