Well, I personally prefer precise specifications, too, but to me it sounds too demanding to expect that a company does something like washing a bike multiple times varying parameters like pressure and distance of the nozzle until damage occurs in order to create those specifications.
I can't wash my bikes at home and I only use them at the track, so I wash them with whatever washer is available there. If I can choose between garden hose and power washer, I always choose the former.
If the power washer is the only way, I gauge its harmfulness by placing one hand at a certain distance from the nozzle and feeling it on my skin, but be aware of the fact that someone told me that he accidentally peeled a little bit of epidermis off of his skin by accidentally putting his hand right in front of the nozzle of a pressure washer. I then keep the nozzle at a distance which feels decently safe for the bike.
Surely distance lowers the damaging power, I guess because air drag highly affects that fast water flow.
I can't wash my bikes at home and I only use them at the track, so I wash them with whatever washer is available there. If I can choose between garden hose and power washer, I always choose the former.
If the power washer is the only way, I gauge its harmfulness by placing one hand at a certain distance from the nozzle and feeling it on my skin, but be aware of the fact that someone told me that he accidentally peeled a little bit of epidermis off of his skin by accidentally putting his hand right in front of the nozzle of a pressure washer. I then keep the nozzle at a distance which feels decently safe for the bike.
Surely distance lowers the damaging power, I guess because air drag highly affects that fast water flow.