Those of you that use Decon - consider this:
It is good stuff but has to be used cautiously. It is probably fatal to pets as well as wildlife.
Rodents will consume it and return to their nests and die. They will decay and stink!!!
The previous owner of our S&B home must have bought it by the case as 23 years later I am still finding an occasional skeleton and tray in hidden places even after extensive renovations. I have sealed the house and had to specifically tear down two walls to clean out dead, rotted and stinking carcasses. We no longer have mice once I had filled their 'doorways', same as on the 5er - and the only real way to control vermin.
Do it right once as chemical and mechanical shortcuts are only stopgap and don't end the problem. Lots of good entry way closing suggestions above.
Dave W along with my DW, Susan and our poodlepups, Callie & Molly,2011 Ford F250 6.7 CCLB, 5er Hitch Option w/B&W Hitch,,Ride Rite air bags, 2014 Montana High Country 343RL (38')