Walk in a room. Go left. Work clockwise, top to bottom until you get back to the door. White vinegar mixed half-in-half with distilled water in a spray bottle. A green scrubby and a cotton rag. That's it, the whole thing. I was a custodian in many, many different environments and that's always cleaned ANYTHING. I did look at the pictures in your next entry and yes, that would be a challenge indeed. I believe the brown crud on the walls is nicotine. Oily, sticky and nasty? Yep.