(Smacks head! Why didn't I think of that!!uh, Now they tell me!) I had to resort chemical warfare to get rid of my gnat problem. I was surrounded by clouds of them outside in Missouri and they liked my pots enough that they came inside every winter☺ ugh! I ended up diluting Bayer Advanced Tree and Shrub down for my houseplants and turning them into poisonous 'final meals' for the gnats and the woolly aphids that were on the roots of some of them. I was already using vinegar to mop the floors and clean the house with...maybe I should have let my mop bucket sit out for a few days...