When my friend Jacy Ong posted a meme that said "You Never Appreciate What You Have Till It's Gone" - "Toilet Paper Is A Good Example" I posted a reply suggesting she rub her butt against the wall tiles. Or get a hungry dog to lick her ass clean. Jacy took it quite well and said she believed those were the days.
The rubbing part may explain why we always see brownish stains on our public toilet walls. Haha. Water is not always available. May be gross, but the dog part may not be as facetious or ludicrous as you might think.