15% off Clearance All sales final Curved 9″ brush design cleans interior curves of hummingbird feeders. Also effectively cleans the ports on tubular feeders. Soft flexible bristles will not scratch plastic. 3 x 1.5 x 9 in Care and cleaning - Clean hummingbird feeders every 3 to 5 days to prevent the growth of bacteria. Wash with hot water and a mild detergent and sanitize with a 50/50 solution of white vinegar and hot water. Rinse your Droll Yankees brushes thoroughly before hanging to dry.