rodent proofing a garage

You would be astounded where a mouse can get into and out of. "Back when" I worked in the two-way / 911 telco field, we did work at remote hilltop sites. You could have a building completely made of metal, the only gap was 1/2" under the door with a rubber sweep, and the "delta" roofing gaps in the sheeting, and "somebody" would find their way in there

Motorola used to make a REALLY stupid base station series which had a "mouse trap" at the bottom service door. This was an upside down "U" where the antenna / power cable went into the radio, with a little slider you were supposed to adjust tight against the cable. Often we inherited a customer from "someone else."

I once found one of those that was so full of (literally) mouse crap that I refused to work on it, and the radio ended up being thrown away. I've got a photo of it somewhere.