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My dd's sigg top has some black mold along the ridges on the inside of her bottle top. I have cleaned it as well as I can with a q-tip and soap and then flushed it out with hydrogen peroxide, but I can still see black. We've ordered new lids (the sports lid doesn't have the ridges inside the cap so should be easier to keep clean), but in the meantime I want to make sure the mold is dead, dead, dead. Do you think I can sterilize the lids in boiling water?