In my experience, they do not work. During a stay in an upscale hotel in NC recently, our room began to smell like a sewer. Later, a downstairs hallway smelled even worse. Hotel maintenance staff put Sani Sticks in our sink and in the shower. They did nothing! It only got worse as our stay wore on. We had no option. We were at a convention in the hotel and the hotel was booked solid. Others complained about the smell, too. Don't waste your money! Baking soda and vinegar work better.
Bottom Line: No, I would not recommend this to a friend
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