I just squished an ant that found its way on the table. After two days of rain, ant invasion in the kitchen is the norm, so I'm not going to worry about that.
But yet again, I smelled that odor that inexplicably reminds me of Formula 409 cleaner. It brings up murky memories of work study in the University cafeteria.
I'm assuming it's the Formic Acid. (Does ANYONE remember the sci-fi novel or a short story about a boy with extraordinary powers who lives with a carnival, and who was constantly derided for eating ants? It turned out that his body needed Formic Acid. Smelling crushed ants also always reminds me of that story, though I've forgotten its title or the author.)
I discovered by accident that if I SCRUB up (as opposed to wiping up) the invading ants on the kitchen floor with a wet paper towel, I can literally clean the floor with them. I think their exoskeleton provides the scouring agent and the formic acid, the cleaning agent. So declare a "Scrubbing Day" when the ants invade your kitchen! (Do you remember the movie Pippi Longstocking? "Scrubbing Day is a Holiday, 'cause on Scrubbing Day, EVERYTHING gets wet!" )