Well, it could be grafitti, or your kid's special art project, but chances are, it is oxidation. This chalky residue is caused by the effect of UV rays from sunlight or a strong oxidizer like bleach (Sodium Hypochlorite). The exposed paint breaks down and the original color is lost, and you're left with a chalky residue. You tend to see oxidation on painted, aluminum-sided, and vinyl-sided homes. The good news it that this kind of residue can be removed with a power washer, so call your local power washer company and have them come over for a consultation.

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