My bottom was soda blasted in the fall and over the winter I've stripped and polished all my bronze intake strainers. My wedge strainers were covered with growth and I'm not sure if the PO ever took them off. Every time the boat comes out of the water the hull is clean but all bronze parts are covered. I've tried several zinc spray products with no luck. Is there anything I can use to help combat growth on bronze parts? I'd like to try something different since I'm starting from scratch.