I used this with jewelry cleaner to clean two watches with built up gunk: a Rolex and a Citizen I have had for years that I used to wear daily. They both came out super clean and look new. The cleaning solution looked very muddy after the cleaning indicating it worked really good. Both watches are water resistant so I was able to submerge them in the cleaner.This unit is perfect for cleaning jewelry like watches, but you should get a larger size if you plan to clean larger items.I’m really pleased with this purchase.