Rose from Monroe, La writes
They are actually getting in the walls.
Hi-Yield 55% Malathion Insecticide Spray would not be the product we would recommend for your application. We would recommend Onslaught Insecticide. This perfoms well on porous surfaces like concrete and brick without the visible residue of wettable powders, and will give you a long lasting residual as well.
Answer last updated on: 06/03/2016