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Moss often grows on roofs because leaves that fall on the roof from overhanging tree limbs retain moisture. Copper sulphate works well to remove moss on roof shingles, especially when the moss is growing and rain is unlikely. You can use copper sulphate alone or a mixture of zinc and copper...

This is a link to an interesting article about how to make your own 2 part wood bleach and use it. It is quite hard to find wood bleach in the shops, and this method is cheaper to make. http://mistralni.co.uk/articles/?p=238