We have a hosepipe ban here at the moment so I have been washing the car with buckets and watering cans for a few weeks.
I got tired of that game fairly quickly so I dug out a waterbutt pump I picked up about four years ago for a tenner (after the last ban had finished

Hooked it up and wired it up and went to wash the car. Gave it a really good wash and wax using the hose and waterbutt, even used the jetwasher to rinse it off.
Normally I use a couple of buckets of water for the soapy stuff and about 6 watering cans full to get it wet, rinse it off and do the wheels.
I gave my little 'un his bath tonight and saved the bathwater to top up the waterbutt. Topped it up using the same watering can.
It took just over 4 cans to fill it back to brim full which is where it was when I started.
So it uses LESS water to wash your car with a hose than with a watering can/bucket
