Japanese used games are pristine, it's too bad we can't say the same for your average used copy at the local EB/GS or Gamecrazy.
My 13-year old nephew tosses his game discs around, doesn't put them back in their cases, and doesn't seem to understand that this shit ain't cheap.
I'm very picky about used titles I get. And, if you aren't already familiar with it, Goo Gone is your new best friend.