Casino chip question

[Penguinfan]

Maybe this belongs in the off topicl discussion area and if so please move it, but I was wondering is there no way whatsoever to wash casino quality clay chips or do the casino's just not give a damn how discusting their chips are? Last time I was at the Trop in AC the chips were filthy, worse than I remember from other trips out there.
Can they not be cleaned for some reason? Pretty soon I am gonna start wearing latex gloves before picking them up.