What SAFE thing should i use to absorb my rabbits pee?

what do i use to absorb my rabbits pee? cuz when ever i clean the hutch out the the scoop (and brush) gets poo and stuff stuck to it, can i use paper bags? but i think they will eat the paper bags, if they can eat the paper bags, how do i know if the ink is safe? Please Answer, God Bless :)