Gah, I've got a friend who's built peddle powered washing machines that would be perfect for salad mix and baby spinach. I'm not mechanically minded and he's always busy - but It'd handle 4 times the load of the 5(ish?) gallon professional salad spinners. Of
course those things have
alot of torque so they spin things dry pretty quick - but it is a pain in the ass to do a hundred spins a day. And the gears pop out sometimes and it can be pretty joint jarring. A C+ product if there ever was one.
Personally I only used mesh tops for drying thing like onion. They're to rough on greens in my
experience. A stainless steel table with a very slight slant to it has been the best I've dealt with. I imagine with 45 shares you have your dunk/swish/shake technique down pretty well for head lettuce and the like. For
roots A good strong hose is the best unless you're going to scale up to something like a potato washer... and even then. For Carrots, Dikon, beets and the like we'd line um up and stack up tall and blast away. Then a quick hands on each piece spray. always moving from one direction to the the other (assembly line of one style - think dish pit) for potatoes or rutabaga or anything without greens. line up a bunch of totes with drainage and fill um halfway. Spray and Shake, and Spray and cull, and sort and spray and cull and spray. again get a system big ones all the way to the right, sized graded down from there with dirty on the right worked best for me.
Plan your harvest intelligently. If you have a walk in fridge get your lettuce early in the morning, if not wait until evening and get your tomatoes out before the greenhouses heat up. Have your crucifers near your tanks - many of them undergo a chemical heating process when they are cut and you want to get them in
water immediately even if its just a quick 45 second dunk.
EDIT: I have used root washers pretty extensively - a potato washer which handled lot of potatoes really fast put spat away the creamers, didn't do carrots or parsnips, and needed several passes to get beets. Rutabaga always needed something more manual. The washer was very wet, very noisy, and is not something I would recommend unless you where growing LOTS and LOTS of roots.