Clean and scrub drains, sink areas, and surrounding surfaces with a stiff brush
Pour boiling water down the drain regularly (when plumbing permits)
Use an enzyme drain cleaner daily for several days, then weekly for maintenance
Apply a drain-safe gel or foam product made for drain flies to the drain walls and edges
Remove and clean sink traps, P-traps, and overflow drains if accessible
Disassemble shower drains/strainers and remove organic buildup; scrub thoroughly
Fix leaks and stop standing water in sinks, tubs, and around pipes
Empty and clean garbage disposals; run with cold water and a drain cleaner as directed
Clean and dry wet areas under sinks, around toilets, and in bathrooms
Remove algae/organic film from bathroom or kitchen drains and grout near drains
Reduce humidity and improve ventilation in bathrooms and kitchens
Use a vacuum to remove visible adults and debris near drains
Place sticky traps near drains to catch emerging adults
Seal cracks and gaps around drain pipes and fixtures where possible
Contact a plumber or pest professional if infestation persists after repeated treatment