I keep an extra bin for cleaning. so I fill the extra bin with wood chips and lay it on the floor. then I pull out a bin from the rack turn it sideways and lay it on the bin on the floor. but I put it to one side so there is the opening up front and no escape out the back. then just lift by the tail and drop em in the hole. slide the dirty bin off the top and lift the clean full bin and put it back in the rack.