We have somehow acquired an infestation of fruit flies in the bathroom – on the bathroom mirror, more precisely – and I can’t seem to get rid of them.

There’s a glass of red wine vinegar to attract and kill the flies, and every couple of days I pour out the vinegar with a few dozen dead flies on the bottom, and they never seem to get fewer.

I don’t understand what they eat, and I guess that’s the problem, because as long as there is something here for them, they’ll keep multiplying. I’ve thoroughly cleaned the floor drain, removed the small garbage bin, removed the ecosystem-in-a-jar that they might find nice with its humid air. I’ve removed the head of Adrian’s electric toothbrush, which I’ve seen the fruit flies land on occasionally – maybe for the fruity-tasting toothpaste. I can’t think of what else it could be.