Let me just preface this by saying I've never had ants before, in any house I've lived in. Or if I have, I think I sprayed once, because they were coming in from the outside and they stopped coming in, and that was that.
THIS HOUSE, which we are currently renting, has a crawlspace INFESTED with the little buggers. Nothing seems to get rid of them! Pest control hasn't killed them. I've tried sprays, foggers, pepper, vinegar, (in my kitchen to keep them at bay) and the fixes are always temporary, because they find another crack in the crawlspace and come up into the house somewhere else. It drives me fershlugging NUTS!!!!! They are in the second floor bathrooms, going after the toothpaste and soap. They love Hubby's computer in the master bedroom for some reason. I can't leave even ONE tiny crumb of food on the wood floors on the first floor (YOU try and keep on top of that with four kids in the house) or we get swarmed.
I am going crazy. It's just a little embarrassing when we have people over, and while we're all laughing at the table and talking, an ant or two will run across the top of the table--just enough to embarrass me and freak out our guests. One of my sons likes to smoosh them with his finger tip. My 4-year old steps on them. I SPRAY and SPRAY. Which usually holds them off for a few days, but they find other ways in. It's like we're being INVADED. Since we're only in this house 6 more weeks I don't really want to call in another pest control guy, and spend several hundred dollars--so I get 6 more weeks of freaking ANTS.