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If it's not harmful to sea life then a great potential market for this would be marine toilets. They all use extremely small amounts of water (especially the freshwater ones) and skid marks are always a problem. Boaters are also used to maintaining things like coating.

Smaller market but a good niche to start and spread from.

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Why do salt water marine toilets use small amounts of water? It seems like that's a resource that is very easy to acquire.

Especially with plastic plumbing

The water and waste are pumped into a holding tank that needs to be emptied. You can empty it into the ocean if you are 3 miles off shore. Most people stay close to shore, so need to use pump out facilities to empty their holding tank. These are often free but not always, and from my understanding are not entirely pleasant to use.

Typical holding tank volume is 20-30 gallons. This is maybe enough for a week? We have a composting head so I'm not sure. Solid waste goes in a dumpster once a month and I think most people end up "peeing in the water". Which is technically illegal and some people think is bad, some don't.

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