I don’t leave food out. Garbage gets tossed, counters are cleaned. I replaced half the windows in my home and caulked up the rest. I bought a salt gun and have been picking them off but there’s always more.
How do I figure out where these little fuckers are getting in?
Start by identifying the fly. Habitats very by species.
Could be something died in your chimney, could be drain flies, could be vents. Could be doors or crawlspaces. Doesn’t take much.