Was contacted about cleaning down a huge horse barn. It is about 250 feet long. Will be going to look at job before bidding. New owner wants cobwebs, debris, dirt removed from ceiling and sides. Would like your thoughts on what I should look for when I visit the job. Initial thought is to "dry" clean by hand as much as possible (i.e. manually knock down the webs, etc.). Doesn't need to be "paintable clean". Your thoughts on a general purpose chemical to use? Any comments would be appreciated. Thanks, as always.