The mice that nested in some small engines I had stored in a truck body shed built their nests in the blower housings,and one Tecumseh they peed and pooped in so much actually rusted the fins off the flywheel,and the magnets glued to the inside of the flywheel came off,and fooled me into thinking it had seized up !..till I took it apart and found they used it for a cesspool ..

..
I had no idea where the magnets had to be positioned to properly fire the magneto,so I had to search for a similar engine that had a flywheel with the magnets permanently made into the flywheel,so it could run again...

...bastids!..
I put drier sheets in the engines shrouds,and they must only hate "Bounce" brand ones,I used some other kind,they just shredded them up and made their nests out of them...their way of saying
I left the door on the shed open overnight--next day I found several mice corpses on the floor and outside,missing their heads..my barn cats took care of them..

..my way of saying

..
I never had any mice in my other "open" shed that has only a section of stockade fence for a door,that is about 6" off the ground and has about 2 feet of open space above it to the roof..the cats often sleep in there especially when its cold or snowy,or raining,so mice never get a chance to set up housekeeping in there..or the few that tried,didn't live long enough to do any damage..