I do mean for use on painted walls and textured ceilings. We heat with propane and our home heater is a vent-less propane unit (natural gas is not available and electric is too costly). Over the course of the winter we end up with a film on all the walls and ceilings. I used to scrub everything each spring but that is no longer a possibility. My daughter is coming home for spring break and has offered to scrub for me while she is here but I need some kind of machine so that I can do this chore in her absence. Thanks for the suggestions you have made so far, I'll go check them out.