All I ever do is run hot water through the tubing every day. I disconnect the tubing and run the water through the tubing backwards and out through the suction wand. Something else that I learned from Kelly is to put a cap ful of mouthwash into the reservoir after cleaning to make it smell less bad.
thats all we do too. after each use, we suction up some warm water to clear out the yankour (sp) and tubing. If it gets too nasty, it may be time to replace the tubing.