Have you been in a public bathroom, in the US, in basically any urban area? Self cleaning doesn't cut it. People cause damage to bathrooms for no apparent reason, piss everywhere within a 10' radius, and on occasion feces isn't far behind. Oddly enough even women's bathrooms, at least on occasion, can be just as bad if not worse - as you can add blood to the entire disgusting mix, people flushing pads, and so on. Cleaning public bathrooms is an unimaginably awful job that nobody, in a million years, would do if they had any other remotely reasonable way to get money, let alone getting handed it for free.

Inflation happens because increasing labor costs will inevitably get handed right back onto the customer, especially on the scale we're talking about. And the customer isn't just the final customer, but every business operation from the raw goods all the way down to the final product, so it'd lead to rather dramatic inflation.