I have a one level c and c cage and fleece bedding, plus piggies who love to drag hay around! To decrease hay everywhere I have a corner litter tray underneath their hay rack, which actually they love to play in rather than toilet in! I also have hay in paper bags/toilet rolls cut down the middle so they can play - the bags keep the hay in, toilet rolls can make rather a mess! The rack and tray keep the hay contained, as does the bag. I then hoover the fleece once a day whilst piggies have floor time. It's not perfect but it helps. When washing the fleece I put it in an old duvet cover so that hay doesn't go into the washing machine.