Adler has the flying saucer wheel, and she poops on it almost everynight. The worst part is, I use Aspen shavings for her, so her wheel gets all sticky and then the shavings stick to it. I've tried litter training, but she's not catching on. Any suggestions for litter training besides having it available and clean and setting her in it everytime I get her out? I hate having to clean the wheel every single morning.