I have a Sears Pak-a-Potti 4000,my manual say's to use a
mild dishwasher detergent to clean plastic part's, and to use (Thetford campa chem) holding tank deodorant., 4oz. after each cleaning.
I think your's and mine would be the same, you should be able to get the chem at Sear's or Kmart
Jim, October 2009