If you have a lathe and I imagine the majority on here are quite handy, when I was a kid my grandfather built their rotary clothesline which used to raise by the town water supply, it was basically acted like a hydraulic ram,
I never knew what was on the inside on the piston rod but could imagine it only being a leather bucket, and the gland seal which was adjustable would have been pump gland packing, to raise the line you just turned on a tap, to lower it you turned on another tap which drained the cylinder.
The other way would be to get an old hydraulic ram and connect your pressure washer to it, if you built a small scissor lift table you would only need quite a small cylinder.
Beech.
