AWESOME VIDEO. - thank you for sharing !! This came up beautifully, you will be able to sit outside without the stains now. I want to do this to my external stairs - but they are still inside of a building - so I am scared I cut off the electric by flooding the stairs!! I wonder if there is any other way to get the results of a power wash, without all the water!! I will ponder on that!! Your back yard turned out brilliant.