Polyjet generally uses a lemonine-soluble or water-soluble support material (and a lot of it, Polyjet cannot bridge or overhang at all as an intrinsic limitation of the technology). Aside from soaking the part to dissolve the support material, there's no post-processing. Also, the parts tend to have a deathgrip on the print bed, so you likely want to just soak the tray with the parts, maybe even putting a layer of soluble support at the bottom of the part to keep the bed fresh. Old Stratasys machines had print beds that were pretty much single-use (they were not however, priced like a disposable part).