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I like cider vinegar in the bottom of a long-necked bottle (like a wine bottle) works really well, once they figure out it's there. You don't want a lot of vinegar in there, just a quarter-inch or so.
You also have to make sure you clean out all your drains -- bleach followed by boiling water should do it -- and scrub out your garbage cans really well, because those are the places they lay eggs in the gunk that gets trapped there.
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