Identify & Treat Infestations. Theyâre weak fliers, thus they usually spend most of their time on walls. This species is the one you will most likely meet in your bathroom and kitchen, and that causes the most trouble in hospitals and other institutions. Once you’ve determined which are the problem drains, you need to clean out the slimy gunk that has collected there in order to eliminate the flies’ breeding zones. [+Tricks to Find Them], 11 Worst Places to Hide Valuables (and Money), 9 Simple Ways to Lock a Door Without a Lock (With Photos). If youâre sure youâre dealing with drain flies, skip this part and jump to the next section. Bob Vila, 12 Storage Solutions for the Utility Closet, The Dos and Don'ts of Air-Drying Everything You Own, 8 Pest-Control Myths You Shouldnât Believe. Expert advice from Bob Vila, the most trusted name in home improvement, home remodeling, home repair, and DIY. They are also extremely attracted to light so they will fly out from the hole. All Rights Reserved. Theyâre often confused with fruit flies, however, itâs pretty easy to notice the difference between them if you know what to look for. DailyHomeSafety may earn money when you buy through links on our site. In our comprehensive guide weâve collected all the best and proven methods to get rid of them fast and easily, even if youâre on a budget. Second, fruit flies are yellowish and lighter in color than drain flies. If you skip this step, you give the flies a chance to find new breeding sites where they can lay their eggs.