All right, in this video I am going to show you how to treat tree tannin stains or that stubborn algae that just will not go away even after you have already pressure washed and rinsed the driveway and sidewalks. If you have still got some dark green spots or, this time of the year after fall we get a lot of tree tannin stains, it is the stains from the acorns and the leaves. It will be these dark stains that you see here on the concrete. They have 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 have got some really stubborn stains. It is 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. 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 have to put it on there as a light mist. Nine times out ten that is all you need. You do not 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.