A few drops and not a single fly in the house: After two months of fighting, they disappeared in 1 minute

Then I remembered the carnation oil tozentrate we had bought in the Nikitsky Botanical Garden. Unlike the diluted oils on the market, this was highly concentrated.

I sprayed this mixture on the curtains, nets and fly screens and placed cotton owl with the oil around the windows. And after 1 minute, 5 minutes, 10 minutes ... the flies had disappeared!