Yes, Decon will work, but dead will decay..no matter what you use..unless you dessicate them first. :bleh: My mom used to use decon all the time, until they'd die in the walls of the house where you couldn't get them out. :puke:
I wouldn't use decon, not with your own mouse/rat colonies. And if they get out and some neighbor's cat or dog or ? got it, the poisoned mouse could cause all sorts of problems. Steel wool wadded up and stuffed tight into the holes where they come into the house will stop 'em too.
When we had 'em, I just kept traps under the sink and in the pantry. It helped that I had cats inside and barn cats outside too.
Good luck!