There are so many cleaners on the market, one for every specific use. We had a pproblem with a hard dinghy that discoloured in a single day while on deck. Apparently there is a microbe that penetrates fibreglass and discolours on exposure to sunlight. We had it and it was awful. Nothing worked. Then I tried Bar Keeper 's Friend. Miracle! [attachment=180]IMG_2462.JPG[/attachment] http://aleriasadventures.blogspot.ie/2014/11/dingy-dinghy-blues-rhubarb-to-rescue.html

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