What kinds of dust, dirt, and little creatures move around in your home?
Use a simple trap to find out. Make a loop of tape with the sticky side out, and press it onto a piece of cardboard. Lay the cardboard, tape-side up, in a spot where it won't be disturbed. After a few days, look at what has stuck to the tape. Place more traps around the home--under a sink or bed, or on a porch. What did you catch?