My roommates were out of town for several weeks, which meant plenty of opportunities to use the bathroom for what it is actually build for! I had multiple sessions with cake batter, pies and custard and made sure to clean up everything extremely carefully. A couple of days before they returned, I cleaned the house (and especially the bathroom) for a final time.
When they returned, they were pleasantly surprised to see the entire house nice and clean, which "had not been the case with previous roommates!" Oh how little do they know...