We've had off and on problems with tiny ants for decades. I've had them swarm food I was reheating in the microwave - while it was running! :: shudders ::
We tried an exterminator (expensive and didn't work) and sprays (HATE the smell, didn't work to keep them away). What seems to work best is ant bait.
The first time I see one, I put out the ant bait, preferably the kind with both sweet and fat. They take the poison home and within days, that bunch is gone. It has greatly diminished the frequency and severity of their forays. I was told way back that they come in looking for water, so we're braced for the usual summer drought.