
I had a couple of popular/used travel mugs that were beginning to look and smell disgusting even with regular washing. I saw these while ordering a new water bottle for my son and thought I'd give them a try as they aren't very expensive. They threw a pill into cups, added warm water and left it for about 30 minutes. I threw out the water, put the brush in and rinsed. You look brand new. no smell No stains. I was very impressed. I would like before and after photos.

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