I use a mix of HOT water, dawn, and, as weird as it is, a little bit of laundry detergent LOL. I typically have to scrub though, so, probably not the best for wallpaper.
I think she was in bale feeder but to be honest I have no clue. She was fine this yesterday morning then last night my in-laws phoned me and said "she cut herself but not super deep". Got back to the farm as fast as I could and that was what I found