Features: Kill Annoying Drain Flies. Fruit Fly Goodbyes Thick Drain Gel Clings To Pipes In Drains To Kill Drain Flies And Their Eggs. Can Be Used As A Part Of Routine Drain Maintenance.Made With Citronella. This Non-Caustic Formula Contains A Natural Fly Killer (Citronella) To Kill Flies Without Damaging Pipes.Thick Clinging Gel Sticks To Pipe Walls And Drain Coverseliminates Nuisance Drain Flies and Fruit Flies That Live and Breed In Household Drains