I like to store the lids on my tupperware so I dont have to search for them, and fortunately i have room to do so. I put in a coffee filter and then close the top almost all the way and they don't have a musty smell!
I have always used a mix of baking soda and vinegar in hot soapy water. Allow to sit for about 20 minutes then use a scrubber pad to scrub. Rinse in very hot water then in very cold and let air dry. If able set in the sun to dry also may whiten it as well. Good Luck!
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