when i 1st bought my house. it was mousecadelic. i talked to my exterminator buddy and this is what he had me do place baited (i used p-nut butter)but not set traps all over. and refill them when needed for 1 or 2 weeks and then bait and set all of them at once. i also used poison. all of my traps caught mice repeatedly and the decon finished em off.