I don't think a hose or pressure washer would work.
The attachment to the purlins limits the gap created for the run-off of water and debris.
If you look at a system, like the Trex RainEscape, it creates a large gutter that has an opening deep enough so that all the debris flows freely to the catch basins, and the catch basins are big so less chance of clogging.
Just rather expensive.
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