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Normally, once mold has been seeded. It is hard to get off. You can change the gasket for about $125 if the machine is still in good shape. Keep in mind most machines require regular cleaning in that spot of Clorox wipes, etc., and should be kept dry at the end of the cycle. Brands like GE have solved the issue by using micro ban antimicrobial gaskets that won’t attract mildew or mold. So GE ultra-fresh is one of the best, and the newer LGs do have a clean cycle as well. Even with the advancements, I would still clean them once a week as preventative maintenance.