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Removing mildew/algae from slate roof

Posted by Missy on May 11th, 1999 05:23 PM

1 of 1 people found this post helpful

Our house has the original slate roof on it (almost 60 years). Over the years, mildew/algae has grown and we are trying to determine the best type of chemical that we can use to remove it (and where we could purchaes it)without having to pay professionals to chemically treat it (quoted $3,500). We are looking to move soon and don't want to invest a lot of money in a house we will only be in a short time longer.

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