Welcome to Marko Janitorial Supply! Marko, Inc. is a leading supplier of quality janitorial products in the Upstate of South Carolina, USA. Family-owned and operated for more than fifty years, Marko works hard to offer courteous, prompt service. Our staff is trained to assist you with all types of cleaning problems, and provide economical solutions from our huge inventory of national brand products and Marko brand products. Let Marko work for you!