Dirty public toilets are a menace to the senses. To get a feel of it, all toilets must drink one glass of water every 20 minutes and whenever they want to pee, pee in a bowl. Whenever you wish to poop, poop in another bowl. Both bowls must remain in the bathroom until your senses disgust you. Then, give yourself a 15 minute corner time in the bathroom before cleaning everything.
For health issues, don't keep it for long. Don't exceed 24 hours. I think ~5 hours is good enough
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