That's rich--trading squirrels!

Trouble with something that lives in the walls that it will eventually die in the walls, and then you'll suffer. An acquaintance of mine in Mississippi has written extensively about the attempt to get the putrification smell out of the plaster walls. They're not sure exactly which section of wall it died in. (This is a possum that had a taste for soft drinks--over time it bit little holes in all of the cans of SevenUP that had been stored in the garage.)

It really is best if you can lure or scare critters out of the attic, basement, or walls before they decide to shuffle off this mortal coil.

SRS