Treehugger highlights the ‘No Wet’ Waterless Carwash - which is available in Australia (though I haven’t found out where just yet).

No Wet Australia has been establishing the business over the past few years. Given that many Australian metropolitan and rural cities have imposed water restrictions limiting the volume of water used to clean cars, their timing seems very opportune.

Looks like a good way to reduce water use when washing your car.

Update: Seems you can order the product through the No Wet website.