I have this on my asphalt sidewalk. How do I get rid of it safely?
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Hard to see but if its like a dry flaky plant its lichen. You can use Wet and Forget outside formula on it.
Appears to be lichen. You can remove this easily with a pressure washer.
Apply Wet & Forget Outdoor with a garden sprayer. Dilute 1 part Wet & Forget Outdoor to 5 parts water. Apply Wet & Forget Outdoor to a dry surface in order to penetrate the stain completely. Saturate the surface completely with Wet & Forget Outdoor to remove moss, algae, lichen, mold or mildew stains.
Use Wet and Leave or Wet & Forget...............
bleach or vinegar