How do you get rid of stains on concrete patio?
We have stains on our concrete from trees (leaves, acorns, whirly seeds, etc.). we have tried commercial concrete stain removers, bleach solutions, nothing has removed them.
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I don't know if it's a "concrete" solution but try either hydrogen peroxide or no a solution of oxyclean....these are using a different chemical reaction to remove the stains.
You might want to check out my post where we tried to get stains out of concrete. I used 2 different products and one worked better than other. Old stains are so tough to get out. But definitely try a power washer as well:
https://karupp-did.net/power-washer/
Have you tried power washing it?
https://www.rd.com/home/cleaning-organizing/cleaning-concrete-stains/
Have you tried tsp?
Try pressure washing
We use Krud Kutter from Lowe's and a pressure washer and works well.
A pressure washer should work if you can find/borrow/rent one