The first question is easy. Do what I do. Take them down, bring them to a large sink (I have a utility sink in the laundry room to use in the fall/winter months) and drench them. Drain and then put them back on the wall. During the spring/summer months, take them outside and hose them down. Better yet, IF you have trees, hang the plants under the trees during the warm months, like I do. Easy.
Like any plant, when they get really large, you will have to divide them or re-mount them. I divided mine. I had one that got over 100 lbs.! Heck, I could not begin to lift her. She got divided into six plants, and each was mounted. There is always a solution for every problem.
