Does anyone else have a problem with mice in their Volvo XC90?

Mice have been getting into our Volvo XC90 for several months now. They get in at roughly the same time every evening (the car alarm is triggered) and seem to be gone again in the morning. I have caught 3 of these field mice in 'live traps' but am beginning to lose patience and require more effective... show more Mice have been getting into our Volvo XC90 for several months now. They get in at roughly the same time every evening (the car alarm is triggered) and seem to be gone again in the morning. I have caught 3 of these field mice in 'live traps' but am beginning to lose patience and require more effective measures. The car has been investigated by the Volvo garage but they say they have no idea how they are getting in. I have tried moth balls and sealing up the air vents on the inside of the car but nothing seems to deter them! I have to clean mouse droppings off my 3 year old's car seat every morning and they are chewing through the seat belt clasps etc. So far the engine seems to be untouched! I would love to know if anybody else has ever heard of this problem and if anyone has any idea how they are getting into the car.
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