Just wanted to let you know that your product worked to my susprising satisfaction especially if you follow specific directions and read the part of sunlight weathering. The part about the sprayer clogging was so true as now I warm the water some to dissolve all the granules before spraying. I had to scrub multiple times in some bad spots that bricks have sat for over two years on the composite but it finally removed the stains. This seems to be the only chemical that works as advertised even though I have tried many others that only gave partial results. Best to your team on formulating a great product. - Ron S.