We recently had a hen walking unstable and isolated her immediately. Soon she was unable to stand or walk on her own (she has been culled and that was very hard to do to our pet). The rest of the flock is acting normal after many weeks of isolation but wanted ideas on cleaning the chicken "hospital" ( the spare bathroom) and any additional tips on cleaning the coop. I've cleaned with a bleach solution but from previous posts this appears not to work for marek's. 2 questions: 1. How do you know it was marek's? 2. What's the best way to clean a bathroom and coop to prevent the spread?