I tried EcoVia EC at an account that was having an issue with cluster flies outside the house. Every time the [homeowners] went out or in, the flies would end up inside. I treated the exterior two weeks ago and the issue is resolved. They still see a fly here and there on the deck railing (which I didn’t treat) but it takes off immediately. And the lack of label restrictions allowed us to treat where we needed. There’s no staining with very little odor, and it’s easy to mix and apply. PROBLEM SOLVED!