Revisions log for Answer #465
This is the answer to the question How do I clean tannic acid stains on my patio?
Revision 1
2022‑06‑07 12:20
Active REV1
Initial text
We had this on our beige sidewalk too. Our child was given an oak sandbox shortly after moving in, and we put it on the patio before the final spot was chosen and the hole dug. Then the rain smeared tannic acid all over the sidewalk in a square shape.
The good news is that it will pass. The bad news is that it takes a long time. With a scrub and water, it got a little better, but it was still very visible. I don't remember if we used chemicals at this time. But time, sun and rain helped.