Remove standing water sources (empty trays, buckets, plant saucers, clogged drains)
Let soil dry out between waterings for houseplants
Use sticky traps near windows, doors, and around plants
Apply a hydrogen peroxide solution to plant soil: mix 1 part 3% hydrogen peroxide with 4 parts water, then water the soil lightly
For fruit flies/gnats around food: dispose of ripe/rotting produce, clean trash cans, wipe counters, cover food
Clean drains and sink areas with a drain brush and a drain cleaner made for insects/organic buildup
Cover exposed compost and keep it dry or sealed
Vacuum adult gnats and eggs from around windows, baseboards, and plant areas
Use an insect spray labeled for gnats indoors, following label directions
Use an indoor bug zapper or UV light trap as supplemental control
Seal cracks and gaps around windows/doors; repair screens
Wash reusable containers and pet areas; keep pet food sealed