Description Concentrated periodical cleaner for the waste-holding tank and grey water tank. Concentrated periodical cleaner that removes scale, encrusting and grease deposits from the waste-holding tank and grey water tank. Why choose Thetford Dual Tank Cleaner? Removes scale, encrusting and grease deposits No scrubbing required! Technical parts inside the tanks are cleaned as well Prolongs the lifespan of the tanks Convenient small bottle