this concrete slab has never been washed in years it's covered in just about everything imaginable we've just mixed up a small batch of green hair and concrete cleaner we're going to show you how to just sweep it on let it soak for 15 or 20 minutes and then sweep it off then you just rinse it with a hose if the surface is really sting then we add a cup of laundry bleach to the minute we mix it one gallon at a time after the surface is soaked for at least 20 minutes you just holds it off with a garden hose you don't need a pressure washer for this job these are the after pictures once the surface of the slab has dried bright spots light you see your honor's sunlight reflecting off the surface it looks like it did when it was new enough of Green Heron to make five gallons of concrete cleaner it's only $18.95 to live into your door anywhere in the USA please order at you