Did you know that dead rats were stinky? All you have to do to confirm this it hold the dead rat close to your face or walk in the same bay (if you are at a car wash).
Vacuum problem
One of my vacuum timers did not have power so I checked it out and something had blown the breaker. I checked the vacuum motors and one smelled like melting plastic and the other smelled fine. So I replaced the stinky motor and everything worked great!