Identify the source
Remove overripe fruit and vegetables
Store produce in the refrigerator
Empty trash and compost regularly
Clean garbage cans and recycling bins
Wipe down counters, sinks, and drains
Fix leaks and eliminate standing water
Dry out houseplant soil
Replace or treat contaminated potting soil
Use sticky traps near infested areas
Set out apple cider vinegar traps
Cover drains overnight
Vacuum up visible gnats
Seal cracks and gaps around windows and doors
Keep doors and windows screened
Avoid leaving food uncovered
Clean pet food and water areas
Take out trash frequently
Use fans to reduce flying insects
Apply indoor insect spray only as directed
Repeat cleanup until the source is gone