We have a dome covered in elastomeric paint. It is only 2 years old and has black streaks all over the dome. Is this mold? What else could it be? How do we clean it?
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The Practical House Painting Guide
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It might be mold, hard to know for sure. Another possibility is pollution and accumulated dust. To clean use a house wash or Simple Green and a scrub brush. A power washer can be carefully used with reduced pressure. Some house wash solutions can be injected through the power washer, speeding up the cleaning process.