The issue about rodents is interesting. We have a big ol' Dodge Truck and don't use it to much anymore. Had to go get something big off island one day and fired it up. Had to stop at a busy traffic light and saw something fly out from under my side of the truck. It was a huge rat yuk! The car behind us stopped at the ferry landing and asked if we noticed it, they said they saw it climb out of the tailpipe or something. It was big enough to make them get out and talk to us, complete strangers! The truck was running rough and the trany was missing so hubby put it on the rack and was getting the trany filter and fluid changed. He was worried the rat may have chewed something. He said the filter or what ever would not drain, so he pulled it out and looked closer, then he made me come and look. There was a rodent stuck in the filter. YUK! AND YUK! don't know how it got there, but never underestimated the power of a rodent.
They don't like moth balls so now we keep some moth balls, in the shed where we keep the apple press. They come in, but don't stick around. We keep things like bird seed and dog food and dry goods in metal containers.