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Message:: [QUOTE="Jhonn, post: 262375, member: 5418"]So, I went to look through the 'cheaper' stuff in my collection (all circulated world coins in a smaller box separate from my expensive coins in a bigger, nicer box) the other day, and I was confronted with a collector's worst nightmare: green PVC slime. I was angry to say the least. About 6 mos. ago, I took all of my coins out of their cardboard 2x2 holders and put them in clear, plasic 2x2 flips I PURCHASED FROM A COIN STORE. Naturally, I assumed they were safe. I look at my coins at least once a week, but I guess  the slime hadn't built up enough to be easily noticeable until now. I had to take each and every coin out and gently wipe them with with a cloth. It all came off easily enough, and the only coins that weren't affected were the nickel coins I had. However, I had quite a few ancients and BU world coins in my 'nicer' collection in those flips, too, so I immediately took all those out, and LUCKILY, there was little to no PVC gunk on any of those coins. I am also glad that ALL my $50-$80 coins in my U.S. type set are housed in hard plastic, 2x2 snap-tites, and all my proofs that were in the plastic flips were housed in Cointains first. Not sure what I should do now (i.e. distilled water dip or acetone to clean any invisible PVC gunk left?), but I probably will go with Cointains and then flips, those hard Amos 2x2 snap-tites, or maybe cardboard 2x2's again. Bleh. Any tips?[/QUOTE]