I don't use water at all. I haven't used water to clean my car or airplane in years. There are lots of products out there that do a great job of cleaning without using water. The fact that we just experienced a 5 year drought had a little to do with it. smile I am lucky enough that my 150 is kept in a hangar and only occasionally needs dusting off. I use Lemon Pledge to clean bugs off the leading edges.

"Maintain thy airspeed, lest the ground arise and smite thee".
[Linked Image from visitedstatesmap.com]