I used to have a roommate who constantly clogged the toilet.
I know it was him because I would pee in the toilet and it wouldn't be clogged, and I'd go back to it later and it would be clogged with shit.
He always denied responsibility, and refused to unclog the toilet, and so this was always left to me, if I wanted to use the toilet. He was extremely stubborn, and would instead go out and find other places to relieve himself until I unclogged the toilet.
Eventually I got tired of this, and, desperate for help, requested advice from another friend.
"Mop his bed."
Apparently this was a joke. But every sane resolution having failed, and being at my wits end, it seemed reasonable at the time.
And so, the next time my roommate left with the toilet clogged, I got a pail of hot water, mixed in some soap, and thoroughly mopped his bed.
My roommate was pretty angry when he got home to his soaked mattress and sheets. And apparently, without my having told anyone, the tale of the mopping of the bed had spread to the other side of the province, and my friend heard that I had actually followed his advice from some random girl at his college.
My roommate also moved out shortly after.
What I can say is that years later, after the mopping of the bed, that toilet has never been clogged, not even a single time.