For the last year we have had what seems like a seasonal gnat problem. During the winter, there are no problems. But as soon as it starts to warm up in the spring, I have them all over my kitchen, mostly in and around my kitchen sink. We thought that they were somehow coming up through the drain in the sink. OMG, I have put so much crap down that sink to kill them off it's ridiculous. I've poured bleach down it & plugged it up at night, everything I can think of. I make sure there aren't any dirty dishes in the sink, no overripe fruit, etc. on the counters. My kitchen is clean! But I can't seem to get rid of them. Any ideas? Thank you in advance!