I do a lot of work in wash-down areas at the local fish plants. It's almost exclusively PVC with carflex. Weatherproof covers for everything. It's basically like installing stuff outside. Here though we have to use stainless steel for any hardware (panels, boxes, screws, etc) because the proximity to salt water eats anything else in very short time. EMT with compression couplings won't cut it.
I would be sure to stick a drain fitting in the run somewhere too because no matter how hard you try, something will fill up with water.