I had just brought my pressure washer out of storage and serviced it and then ordered a foam cannon … and before the foam cannon even arrived the local water district put drought restrictions on car washing: we are not allowed to use water fresh from the tap or hose for car washing! So, we were already saving the water from the showers that flows before it gets hot, so that water is now in buckets for car washing. Last week my wife got an email from Kärcher, a German cleaning machine company, for a battery powered small pressure washer and we bought one. I have ordered and am now waiting for the proper foam cannon for this new little toy to try it.
Rather than the 3000 psi from the gasoline engined power washer, this one is variable from 150psi to 600. Besides the lower power so I worry less about my paint, something seems right about using a battery powered washer on my battery powered car.
I will post more after trying the whole system.