Have never used a pressure washer with mine I have always hand washed (and hand polished), just a bit of hard work and willingness to look after my car When I get the chance, Im out there with my buckets, wool mitt etc - and why not, it looks nice when its done
That mobi washer actually has no pressure to write home about.
It was great when the hose ban was on and one fill of the portable tank did the whole car.
However nice to see someone else shares my enthusiasm for DIY:)