You can always pop rivet a piece of aluminum flashing onto the inside of the tub. Has the benefit of covering a spot they've already chewed through so you can keep using the tub. I've had the little buggers do significant damage in the time it takes to take the empty bottle to be filled and bring it back. For those gluing a washer to the inside, do you have issues with them getting it loose? The little buggers seem to live to destroy sometimes.
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