How to Remove Tannin Stains from Concrete

All right, in this video I’m going to show you how to treat tree tannin stains or that stubborn algae that just won’t go away even after you’ve already pressure washed and rinse the driveway and sidewalks.

What causes the dark green spots on my driveway?

If you’ve still got some dark green spots or, this time of the year after fall we get a lot of tree and tannin stains, it’s the stains from the acorns and the leaves. It’ll be these dark stains that you see here on the concrete. They’ve already started to kind of fade away because I post treated the concrete. But, if you just want to add a little touch to it or you’ve got some really stubborn stains.

It’s going to take about a 30% mix, up to a 50%/50% mix. How you do it is just to apply that on there and just leave it. Some of these stains are set deep into the concrete. Concrete is very porous so it gets set in there deep. Some tree tannin stains are really tough to get out. They had a lot of acorns on this property.

What should I do for stubborn tree tannin stains?

If you continue to see some dark green spots, just come back and hit it again with about a thirty percent mix up to a fifty-fifty percent mix. You just want to be careful when you spray it, of course. Stay away from any sensitive landscaping or lush grass. If you look, you can already see some of this is already going away just from that initial spray there.

One thing that we do a lot is, we think more is better. But you just got to put it on there as a light mist. Nine times out ten that’s all you need. You don’t have to keep saturating it with the your mix. Just put it on there, spray it, and kind of forget it. Soon these tannin stains are already slowly starting to go away. Once they start drying and gets deep into these pores these tannin stains will be long gone.

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