I just cleaned mine 2 days ago and went to the trailer yesterday to see if the anti freeze stayed in the bowl. It did and I'm happy again. I used a latex glove and some paper towel to clean the seal and bowl up. I then held the valve open and ran my fingers around the underside of the opening with scuba diver lube. When I flush I try to make sure that the blade is seated properly by letting the blade slam from the open position. The rubber around the opening has to be cleaned every once in a while with a toilet bowl brush.