I used the de spray ( they fly but they have to land somewhere ), menthol, sealed, cleaned really well and i am finding less 2 nights i did not find them on me. My house is old horse hair plaster and old mouse nests ( way before my time here ) I demolished a room and I think a nest of them. Getting the bags of pld materials out has even helped. I had not sprayed my walls or ceiling in a long time because the morgs were no longer all over them : )