all these years I had been going about it wrong. I was trying to find a chemical means of neutralizing urine odor, and while clorox worked best, it took a considerable amount. the answer was so simple: oil. I used baby oil, but a water-miscible oil such as castor oil might work as well, and would be less likely to cause problems at the sewage treatment plant.
it works not by chemical means, but just due to physics, it floats on top and keeps the smelly chemicals from vaporizing.
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