Bought a bottle of cleaner called Toon-Bright to clean the bottom/waterline of what i would describe as pond scum. This product contains two types of acid. Can anyone give me a bit of info on the best way to use this product? I would think that a scrub brush would be needed but the directions state spray on, let it work, and rinse off. Right now in OH it is too cold to try it out as the temps need to be 40 degrees or better for the product to work. I hate winter! Thanks Mitch. Their are old sailers and bold sailers, but their are no old/bold sailers. 