If like me, you have had your car parked up for any length of time, there is a chance that it may have suffered from condensation.
This is bad on every level - it facilitates mould, does no favours to your electrics, and makes the interior smell dank and fusty. This video shows a super-easy way of solving the problem - cat litter!
By the way, this solution can be used ANYWHERE that suffers from humidity or condensation. Plus the cat litter can be used again and again by drying it out in the oven periodically .... Simple.