Originally Posted by christian.hess
......if you want to have a clean head use some joy and leave it sud in the bottom.......
Except, this will kill the aerobic bacteria colonies in the tank, when you flush, that are necessary to break down waste in the tank and do not smell. If they are dead, the anaerobic bacteria will multiply and they are ones that stink.
Some "nuke" their tanks with stuff designed to kill everything. However, they always degrade and, when they do, the stinky bacteria have a field day. Not to mention, they are awful to be pumping into the environment, whether overboard or ashore.
There are products that will not kill the good bacteria, such as Raritan CP. One bottle will last a couple of seasons. It isn't really the bowl itself that smells.