When I first got my 300E I didn't drive it very much. One day I opened the hood and found a really big nest between the engine and the aux. water pump.

This was in a garage.

I tried traps to catch the mice but the local farmers told me I was wasting my time because they could reproduce faster than I could trap them.

I followed their advice and put poison in the garage. The mice took the poison back to wherever they nested. No more signs of mice.