I've discovered a product to help keep my head clean.
That would be the toilet on the boat, of course. We flush with salt water and there are some unpleasant downsides to that. We get scale buildup in the bowl and the hoses, and there is an odor which isn't directly attributable to the use of the device. The scale problem we address periodically with couple good doses of muriatic acid. That's my type of cleaning, but one must always be aware that what he's flushing is not actually leaving the boat right away. Pete used to joke that I was going to turn my 50 gallon holding tank into a 50 foot holding tank. The rest of the problem fell on the housekeeper, which wasn't fair. It wasn't a clean problem, it was a water problem.
The solution came to me on the magic box during a business trip. Scrubbing Bubbles Toilet Cleaner Gel. It is a little gel turd that sticks to the side of the bowl. The rinse water runs over the gel and carries the scrubby guys all over the inside. I haven't seen the scrubby guys myself, but they were on the magic box so it must be true. The gel lasts for about a week and then you put in another one. We've been using it for about three weeks and the results so far are good. Toilet looks cleaner, and smells MUCH cleaner. In actuality it probably isn't, but who cares? I'm willing to pretend.
Two things have to be considered when using chemicals like these. First is how they'll react with our plumbing, and our plumbing isn't just pumps and hoses. We have a septic tank after all, and there are little critters that live in there. Those critters work on breaking down all the stuff we send them. If they're alive and well and have lots of air (ironically) there shouldn't be much odor from the tank. But if we kill them with the wrong chemicals, then its like living with a septic tank in the house. Having used the Scrubbing Bubbles for three weeks with no apparent change to the tank, we're considering it a success.
The second concern is what impact the chemicals will have if flushed overboard. Considering all the other cleaners and detergents we routinely send overboard in our graywater, there probably isn't much additional impact, but it is still a good thing to think about.