This is crazy to me, I have never had an issue with lines, or anything else like what you are describing. Everything seems to comeup easily. With the exception of lichen. I have had an issue with that and just over looked it on a walkway. I will read the post, I am assuming it is just SH and maybe a foamer. My next driveway will get a pretreat, I will soap the house, cut the edges on the driveway, rinse the house, wash the driveway. Should make things go at a decent speed.