Amazon.com: Superio Deck Scrub Brush with Long Handle 48 Inches, Heavy Duty Stiff Bristles Grout Scrubber with Scraper - Cleans Hot Tub, Swimming Pool, Granite Tiles, Bathroom, Patio, Kitchen, Wall and Deck :
10" ColorCore Red High-Low Stiff Deck Brush | U.S. Plastic Corp.
Standard Deck Scrub Brush - 10" H-3536 - Uline
Rubbermaid Commercial Products 10-in Poly Fiber Stiff Deck Brush in the Deck Brushes department at Lowes.com