Tom from Hillsboro writes
How does Pemetheran work? We have a log cabin and have tons of flies coming in all during the seasons.We caulked every crack and hole we could possibly find. Could it be the're laying eggs between the logs and then those eggs are hatching later. Does Pemetheran leave a residue on windows if we try it?
Yes, Permethrin SFR 36.8% can be used indoors for flies. We recommend spraying this in cracks and crevices. It can leave a residue after spraying that will kill flies that contact the treated area long enough to get a lethal dose. We would recommend using hot soapy water with a mild detergent to remove any unwanted resiude. We would also recommend reviewing our guide on how to get rid of flies.
Answer last updated on: 03/23/2023
