Looks like mold. Try oxyclean in a test area
There are black spots coming from the joints does anyone have an idea of how to remove this.Thank you in advance.Visit list archives, subscribe, unsubscribe or change your subscription preferences: http://stoneandtilepros.simplelists.com/sccpartners Start a new conversation (thread): sccpartners@stoneandtilepros.simplelists.com
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