I recently acquired a 1999 Holiday Rambler 36ft fifth wheel. It seems ok from a mechanical and structure standpoint but the interior is a filthy mess. As far as I know the previous owner was not a smoker but the walls and ceilings have 20 years of dirt, grime and grease throughout. To provide some perspective on what I'm trying to clean, this is a photo of part of the ceiling. This is a big trailer and it's going to take a long time and a lot of work to get it cleaned up. Looking for any suggestions to speed the process up. The "clean" section was done with Clorox Cleaner with Bleach.