I think most people who have nothing on the floor of the cage use a litter box. It is a short box that your rabbit can sit in, with litter in it. If you cover the litter with hay, your rabbit should use it right away to make his smelly messes. I am not sure what you mean by "wc." If you mean wire cage, that can hurt your rabbit's feet. I used a wire bottom cage before but my rabbit lost the fur on his feet, and I had to cover the wire with cardboard. I hope this answers your question.