He does a general sort of clean up once a year, at least! To be fair, Dirk eats a lot of pizza, so they do accumulate quickly.

Dirk winces at the crunch. "Careful! Err... here, the kitchen is a little better, ceiling-wise. I can call them from there..." He waddles up the hall to the open kitchen door, one hand on the wall. Of course, the kitchen is more cluttered than the hall, and there's the doorway to get through...