I recently discovered them. I have a nightguard and my dentist gave me free samples of denture cleaning tablets to clean it.
Then I learned that it cleans my sink too.
Wondering about where else to use it for Pesach cleaning (obviously officially kashering surfaces is still required. Still this is a cool way to do the preliminary work)
LB: many cleaning products have either chametz or kitniyos. Some are allowed on Pesach and others are not. Please visit the websites of the OU and the Star-K and download their Pesach guides.