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ANY ADVICE ON AN EFFECTIVE AND EFFICIENT FOR CLEANING CEDAR SHAKES? I SAW PREVIOUS POSTS MENTION COPPER SULFATE AND SODIUM HYDROXIDE FOR CLEANING. I'VE ALSO SEEN "APPLE SAUCE" IN A POST. PLEASE ADVISE AS THE SHAKES ARE CLOSE TO 30 YEARS OLD WITH LITTLE ALGAE AND MOSTLY DARK GREYING.:confused...