if you stop using clorox and other harsh chemicals to your
holding tank. Yes, vinegar and mineral oil are not harsh chemicals like bleach or ammonia and they are ok to use to lubricate and clean out the pipes.
I had the opportunity to go to a friends new (to him) Endeavor 32' and at first I could not stand the smell of the cabin without keeping the companionway,
hatches and several ports open. Once we finally pumped out and flushed the tank (there was a clog in the air vent) and I treated the tank with "KO" I kept the door to the head open. It almost smelled sweet but was much better than before.
If you need to clean the bowl use whatever product you must but immediately
pump it out and re-dose with the "KO" on an empty tank. You will be amazed at the transformation of odor.
The best thing you can do is flush your
holding tank with fresh water (under pressure) a few times to get rid of as much crap (?) that was coagulated there with all the 'miracle additives' former PO's put down there and
pump all that stuff out. Then start a new regimen with "KO". You will be amazed.
I read Peggy Hall's book and she got it right. Anaerobic sulphurous stink is way worse than the sweet smell of the aerobic bacteria doing its job. It helps to have to air vents if you can swing that too.
This thread started a few years ago but it is still valid for those not in the nose.