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Black Slime

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From: Renee Wiesner
Oquawka, IL
Hello On our property off the Mississippi river, we have a creeping black slime/mold and would like to know what it is and how we can get rid of it. It is mostly in the driveway area which is rocked - when it is very dry (no rain) the black substance dries up - but as soon as it gets wet, it becomes extremely slippery. Do you have any suggestions? Thank you.

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