Here was another attempt to clean the ink off the walls. The suggestion I got from someone was to use rubbing alcohol. Unfortunately all that did was mostly smear the ink around. Kiki did manage to get one spot (maybe two inch square section) ink free! Perhaps it would work if I had a gallon of rubbing alcohol and a month to devote then we could get the rest off. The fumes after five minutes was quite enough so I am not sure I would survive three sides of a room worth of work.