I did that once too. Nearly took a bottle of bleach before I'd allow anyone in that bathroom again. I said never again too!For my first batch last year, I used a small bathroom with shower stall. It was great for temperature control, but the cleanup afterwards was insane (everything was coated with dust). I moved the chicks to a make-shift brooder in our garage afterwards.
This year I am setting up a brooder (for my new keets that arrive this Wed) in a spare coop.