how to stop cats from spraying

[Guest]

I have a question regarding cat spray.
I own a truck, like a jeep, that has removable doors. In the summer, I keep the doors off, which is great, except it allows cats to enter and spray in my truck. They do this frequently when I am parked at a freind's house, or at home, when I leave the garage door open. It is always such an unpleasant surprise to be greeted by that lovely smell, and then having to find it, and wash it out. It seems like I never can quite get rid of it all, but I keep trying.
My question is this-- is there anything that will discourage cats from spraying? Like a chemical or something (that won't bother me, and won't be toxic to them)? Is there something good to wash the spray off with?
Any suggestions?

[Traci]

You can try Cat-Off™, available from your vet. I wouldn't rely on it however, or any other product, since cats are naturally attracted to an open vehicle.