I really want/need to try to litter train two of my males (Apollo and Benny). Their cage mates and unlike my other rats they poop and pee literally EVERYWHERE in their cage. They never do on me or when they are out of the cage, but in there they dont just go on their bedding in the bottom-oh no- they go on ever level and then accidentally knock their poop out onto whatever is nearby. I've done some reading on litter training but Im still not so sure how to start especially since they are both already a year old. I dont know why they cant be cleaner like my other boys.... :/ Any advice?