Live in a rural location and park the car in a barn. Recently been getting mice into the car as I've found droppings. Placed traps over a few nights and snagged two of them. Pulled the cabin air filter and their was what seems to be `insulation' around it and the filter itself was quite dirty. Any ideas on how they are getting in? I placed some steel wool along the area under the hood where the hinges go in but other than that, am perplexed as to how the little guys get in.