Since we're on the topic of keeping bathrooms clean, I have some
other recommendations as to how to keep bathrooms clean.
See "Keeping Toilets Clean" inside "The Hovering Cycle"
http://thomaslevine.com/!/hovering-cycle/#keepingtoiletsclean
and sections 5.2 and 5.3 of "Unsanitary conditions in the Risley
Hall bathrooms".
http://thomaslevine.com/!/risley-toilets/risley_toilets.pdf
Tom