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Can you get a picture?

Are they real small like dots? Sticky?

There are several scenarios. Here is one, that may actualy be your problem. No pic, or better description. So I am just guessing.

Sooty Mold. Generaly dark to almost black but have seen it in lighter colors. Aphids that suck the sap from a plant will discharge a sticky residue. What will then happen is dust and polutents will stick to the residue.

Please provide more info of your problem
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