whenever my dad gets to shopping (not for lack of pestering on my part), most likely the first solution will be chemical--but in the interim i'm just trapping them and drowning them as they appear, which has worked well enough because i only see one or two a day and they really stick out against our walls. helpfully they also don't seem to have gotten into any furniture or other places it'd be hard to root them out from, and we vacuumed the area they originated in which i suspect got a lot of them early