We were away for a week and now have gnats in the bathroom. I think they could be drain gnats- I've used boiling water and vinegar in the tub drain but they are still coming around. I think they are in the drain. I will put tape over it tonight as suggested on a website, but wondered if any of you had had them before and what you did to get rid of them. I want them gone NOW but of course don't want to use any poison. Thanks .