Pour boiling water down the drain daily for several days
Clean the drain thoroughly with a stiff brush
Remove and scrub the drain cover and stopper
Use an enzyme drain cleaner overnight
Clear out slime and buildup inside the pipes
Fix any leaks or standing water around sinks
Keep drains dry when not in use
Take out trash and food waste regularly
Clean garbage disposals and sink traps
Use vinegar and baking soda in the drain
Set out sticky traps near the drain
Cover drains overnight when possible
Check nearby potted plants for fungus gnats
Replace damaged or clogged drain parts
Call a plumber if the infestation keeps returning