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I'm a novice roof cleaner, and am about to start a job finishing a roof clean for a neighbor. He has sprayed about half his roof with a bleach compound and that area now has the rusty looking dead moss. Beyond just giving the dead moss the brush-off, are there any concerns involving what I spray on to finish the job? For instance, do I remove the dead moss and just proceed with my cleaning as normal? I know, my rookie is showing.