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Watch out for ozone machines, a restorer I know that uses them says that it "dizzolves rubber". They have a special room they fill with ozone to "de-stink" items and a portable ozone machine for location work, but say to make sure you never do it to anything with rubber in it. He also said it can have a bleaching effect on some materials (they lose color). I can't verify but this is what he told me.
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