I was doing some research on finding larger tubs of Goop online and came across a link for GROOMER'S Goop! It seems that they sell the stuff for people with show cats/dogs to clean stained paws, tear stains, etc. No wonder it worked so good on my boy's tial! AND now I definitely know it is safe to use on him. Going out to the auto supply store today to get another contianer and will be sure to take some before and after pics when I do another treatment when the weather warms up. I want his tail REALLY white, lol.