I think the only rule is to use the least force necessary to do the job. It's all to easy to do damage by removing paint, shredding wood fibers, blasting stones out of exposed aggregate concrete, blowing water past seals, etc.

When cleaning concrete I always use a turbo nozzle at low pressure and work the pressure up until it starts to get clean. With a high pressure unit it's possible to etch concrete.

When using a pw that doesn't have adjustable pressure I start with the widest nozzle available and hold the wand a fair distance from the surface then slowly move in until it starts doing the job. If the surface isn't getting clean I switch to the next smallest nozzle, and repeat this procedure until I start getting good results.

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