Greenie said:, I would elect to pay more and get a motorized spinner where the jets are pointed slightly forward in contrast to most which are in reverse, with this configuation the limited pressure is cutting into the path, not pushing away from it, the motor spins it forward so you don't need pressure to power it, at this level 3-500 psi will actually work.
about high pressure cleaning. Here is a video, that will answer your questions.