The left paper towel is from before mopping. The middle paper towel is after mopping once. The third is after mopping twice. In order to pass the paper towel test, you can’t wear shoes in your home. You can’t have indoor and outdoor pets. You mustn’t go outside barefoot. Lots of things. Even after four mops, you can almost pass a paper towel test. Almost. We are happy to mop as many times as you like, but pricing will go up.