That pressure washer looks to be exactly what I use. Do you like yours? I wish mine had about 500 more #'s of oomph, but it works for everything from reclaiming to stubborn halftone development without blowing out stencil. It could be that 500 more might be too much.
It looks like the rack has JUUUUUUUUST barely enough aluminum to catch the frames. But with that type of extrusion it's hard to get all the water out, 100%. You've definitely helped that, and forget the 'REDNECK' part of this. If it works, it works!