Thanks everyone - Great advice all. The space was jammed with "fluff" and we found a 28"-long flat attachment for the shop-vac. We got everything that was reachable then we disconnected the pump hoses (top, bottom, and tub) and rinsed the remainder. No problem at all since the "fluff" was all loose and soluble in water, once you could get some room for the water to gather.
Learning in Ohio