Here is some info

http://www.carbag.com/support/omnidry_desiccant.html

On 1/21/2011 13:50, brian wrote:
> Hey all, I have a C6 that I store for the summer while away. I have
> been just leaving it with a car cover in a carport (in San Diego) with
> a battery tender and things have gone fairly well except for a little
> mouse activity. But this has been a very good year for the little
> beasts and their larger rat cousins and I am getting a bit alarmed by
> what damage they have already done to my wife's van.
>
> So.......... I researched bagging the car to ward of the critters.
> Seems there are actual zippered bags available, but being frugal and
> already having a large silver tarp available I decided to wrap it up
> in that as a trial. I wrapped it up and was able to get it tight and I
> think rat proof. So far so good, even though it was a lot of work and
> took two people, several binder straps and bungee cords.
>
> But after I finished I got to thinking about moisture building up
> inside the bag/tarp. Probably not good.........
>
> Have any of you bagged your car and is there a solution like descant
> that will take care of any condensation issues for up to 6 mo's? How
> much is needed? Where do you buy large amounts of the stuff or other
> solutions? I put it away warm, would cool be better in a moisture
> generating sense?
>
> Any experiences or other approaches to pass on?
>
> brian