Confusing infestation:

Lately there's been ants around my bathroom wash basin, like not a ton, but every once in a while one or maybe two and sometimes even three. Like, why would they be there? The most that's there is soapy moisture and flecks of my stubble after I shave, it's not like it's a food source or anything, or even near any food source. So, I crush them with my finger when I find them, and once or twice I've washed out the basin with a moist rag.