I have had awesome success with food grade diatomaceous earth. We spray it all the way around our foundation with a pest pistol (Pest Pistol Applicator: Diatomaceous Earth Duster Bed Bugs Lice Fleas Roaches https://www.amazon.com/dp/B01FG3V7XE/ref=cm_sw_r_apan_glt_fabc_N05TDRXM88K8VJ2FYWYY) twice a month. We rarely find bugs in the house anymore.