Your Place: It's black algae again, staining a roof - Republic

Q: We have dark streaks on our roof that have appeared over the last couple of years. Shingles are cedar color. Our home is a rancher with a hip roof and 4-inch pitch. Streaks are unsightly, and we don?t know what procedure to follow to get rid of them.

Source: http://www.therepublic.com/view/story/HOME-YOURPLACE-8347696/HOME-YOURPLACE-8347696

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