For continued deodorizing, don't rinse afterwards. If you're not going to use the vehicle for a while, and it's stored where it won't get wet, empty the back and fasten the door open to prevent a musty stench. If you store some spare articles of off-road clothing in your vehicle, safeguard them from mustiness by putting fabric softener sheets in between them to absorb odors and leave a fresh scent. When storing gear inside your vehicle for any length of time, prop the items at odd angles to the furniture so that air can flow around them. The same holds true for gear stored over the winter in a garage.
Sufficient ventilation is the nemesis of mold and mildew.