Flatmate Frustrations

How can someone clog up a bathroom sink so fast? Seriously. The Hausmeister (like a super) came and unclogged everything in May or early June, and now the bathroom sink is already clogged again. The bathroom sink was never clogged before this Mitbewohner/flatmate came. Also, about a week ago I cleaned the bathroom sink. I mean, it was shiny white clean. Seriously a day or two later, there was already a layer of dirt and grime in it. How can one male (a student even... it's not like he's a lumberjack or something) seriously accomplish that. It is so disgusting. When I cleaned it, the dirt and grime was unbelievable because no one had cleaned it since he moved in (April sometime), and so I was ok with that. But seriously, in the span of 2 days to make it noticably dirty again. Seriously. Clean up after yourself for once. And he also always clogs up the kitchen sink because he leaves gross food bits in the drain (on my side of the sink even) and doesn't get rid of them for days, if ever. It is disgusting the way he leaves the bethroom and kitchen. I'm not saying I'm miss squeaky clean, but at least I clean up after myself, especially when it's a shared area. Ok, rant is now over.