Old habits die hard. Most of us in the United States were raised in homes with upright vacuum cleaners; chances are your mother used an upright at home, and your grandmother before her. Now you use an upright not just at home, but also on the job. A recent survey by Sanitary Maintenance magazine found that 80 percent of cleaning equipment distributors named upright vacuums as their company's best-selling item, while canister vacuums accounted for just 2 percent of sales.