Multi-story buildings must be maintained. Cleaning common areas like hallways and staircases should be done regularly. Pay attention to damp spots, look for signs and symptoms such as mold growth and wipe down counters. You will be able to keep your multi-story building clean and tidy. Cobwebs can be found behind furniture, in corners and on stairs. Once you have identified the problem, you can use a vacuum or brush to get rid of it before moving on to deeper cleaning.