One use cleaned the caked on coffee stains from my stainless coffee cup and thermos. Blew my mind. Buy this.

My husband leaves his stainless coffee cup at work and just rinses it out. When these arrived, I had him bring it home, dropped one in with warm water, swirled it around and rinsed it out. It looked so much better! I did find that a quick swipe with a dish cloth took almost all of the remaining coffee stains out of his stainless cup.

I gave a couple to a friend. They let it sit for a few minutes and said their stainless mug looked like new inside. So easy!

This is great to use in between washes,! I go through 2-640z water bottles a day, and they can get pretty scummy at work. (I work on a farm)