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Title: Almost great but major flaw
Review: My husband and I have both used a set of these mugs we bought at Costco about two years ago. They are excellent in every aspect with the exception of one thing. As other reviewers have noted, they smell horribly after awhile because coffee, milk, etc. gets inside the plastic top piece and rots. We clean ours extremely well and yet I must throw them out because there is no way to get to the source of whatever gross stuff is stuck inside them.
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