Answer by
Serj22 (70)
To remove stains from concrete, get a heavy duty wire brush and some concrete cleaner from a hardware store, make sure it has no bleach in it. Scrub at the stains by hand, then powerwash the rest away. You can seal the concrete as well to make it easier to clean next time.
This did not work for me, but wet the sidewalk down, and sprinkling baking soda on it worked very easily. Its chemistry. Acorns produce acid, baking soda is a base. add a comment