National Supply is a janitorial and cleaning supplies company based in Beltsville, Maryland, near Baltimore. They stock over 20,000 products including cleaning supplies, floor maintenance chemicals, cleaning equipment, de-icers, office products and building maintenance supplies. With more than 15 years' experience, they offer friendly customer service and back all their products with a money-back guarantee, plus they can usually source items not in stock. Refer them to businesses in the Baltimore, Maryland, Pennsylvania, Virginia, Delaware and Washington DC area that need reliable supplies for cleaning and building maintenance.