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Underconsumption Rule
(sh.itjust.works)
They're dishwasher safe! (At least so far) I throw the caps in the utensil basket.
If the label is paper, give it half effort at peeling, then let the dishwasher take care of the rest. If it's plastic, peel it off and let the dishwasher wash off the goo. I have had it take a couple cycles to get it all off, though. I do this with Calypso bottles mainly.