I'd get this one in an acetone bath as I see what looks like a build up of PVC gunk the green stuff. Won't hurt to q-tip rub on those spots a bit either since it's so low grade. At least stop the potential damage before it starts to eat into the surface and cause pitting.
"Buy the Book Before You Buy the Coin" - Aaron R. Feldman - "And read it" - Me 2013!
ANA Life Member #3288 in good standing since 1981, ANS, Early American Coppers Member (EAC), Colonial Coin Collectors Club member (C4), Conder Token Collector Club member (CTCC), Civil War Token Society (CWTS) member, Liberty Seated Collectors Club (LSCC) & Numismatic Bibliomania Society member (NBS), USMex, Member in good standing, 2¢ variety collector.
See my want page:
http://goccf.com/t/140440