Fish Window Cleaning Inc. is one of the largest window cleaning companies in the world. Based in San Marcos, Calif., the company provides its service to more than 100,000 commercial and residential customers throughout the United States. The company specializes in cleaning ground level storefronts, one, two and three story office buildings, restaurants, banks, churches, schools and homes. Fish Window Cleaning Inc. offers an array of products and services, such as exterior windows of all types, storm windows, construction clean ups, screens, mirrors, chandeliers, ceiling fans, gutters and skylights. It is a Better Business Bureau (BBB) accredited business.