Hey Ched, there is this stuff called QEW (quick easy wash) that people are using in places where they aren't allowed to wash b/c of the 'runoff'. No rinse, no hose. I've used it before a car show after driving in the rain for 4 hours on the highway. Worked like a charm.
Protect All QEW
Check it out. Worth a shot right?
QUOTE: Quick & Easy Wash is a non-abrasive, anti-static, water repellent wash that leaves a super clean, sparkling shine with no streaks, spots or soapy film. Quick & Easy Wash is specially formulated to allow washing without rinsing. For all vehicles.