Today's the day and first thing when I got up this morning, who's in my inbox? The Cleaning Association offering advice and support! Thanks so much. I can't tell you how valuable this site has been to me while starting this business.
I went looking in stores for a good tool and found that they make larger sized wood floor cleaners with removable microfiber covers. They are designed to apply finish to hardwood floors, but I think they'll be good for the walls because you can take the cover off and clean it when it gets too full of dust.
I'm trying those today ~ I'll let you know how they work out!