I have two sets of tubs for every animal I own(usually more, but at least two per animal). I will just get my bedding in the new tubs, pull the animal out of the old tub, put the animal in the clean tub and slide it into the rack. then once all of the animals are in their clean tubs, I will go clean all of the dirty tubs....really easy and the most efficient method I have found. it is also nice if I do not have time to clean the dirty tubs right away...I know my animals are all in clean tubs and I can get to the dirty ones when I have time. I do the same thing with my water bowls...have more than one per animal and change these out as I clean.