Originally Posted by This is Pete
I'd use one of the humane (one-way door) traps. I'd hate to think how far blood splatters might travel with one of the spring jobs.
Or just leave the car alone for a day or two. If the mouse got in, then it should be able to find it's way back out again when it gets hungry.
No blood spatters - but they do leak.
Mouse needs water - will leave when thirsty. When hungry it will start chewing. If it's confused with the changing weather and thinks it has to build a nest then it will chew soft materials (especially foam) to make a nest. Very destructive.
Get a few different types of trap and leave them around the car. And leave them there after
you've caught the first one - they don't exist as individuals. Replace the effective trap exactly as before - the scent of the previous mouse will attract the next one.
Are you sure it isn't just a piece of trim squeaking?