Can the insulation on the lid be cleaned? Mine is kind of dirty, not really sure what the real finction is, just some place for grime to go I guess. Mine is off the lid and I have the original rivet that might be able to be reused (looks like a brass rivet) I have the 3 prong holders. My lids are rechromed and in trying fo figure out how to set that rivet without scratching the lid.

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