In my racks I lay two sheets of newspaper down. In the visions I have to use to whole sections of newspaper for each cage. But I usually check on my snakes every morning and everynight and if I see someone with a dirty cage I go ahead and clean it up because I think its easier to clean when its fresh and wet then after it dries and you have to get in the cage and scrap it out and everything. So I try my best to clean it as soon as they go or as soon as I catch it but that doesnt always work they like to go while im at work. lol