My son who is potty training was running around with no pants for ten minutes before bed. In that time he pooped on his brother's rocking chair and on the floor in his room. First off, can I put the chair cover for a dutailier rocking chair in the washer because the poop is not coming out just scrubbing? Second, how do I get my son to start pooping in the potty? He does okay with the pee, but he is awful with the poop.