I HAVE WHITE MARKINGS ON MY PATIO BRICKS. I ASSUME THESE WHITE MARKINGS ARE CAUSED BY LIME FROM THE GROUND OR MAYBE SOME FROM THE RED BRICKS THEMSELVES. HOUSEHOLD LIME REMOVERS, BLEACH, TSP, AND PRESSURE WASHING FAILED TO REMOVE THE WHITE. MURATIC ACID DID HELP SOME BUT DID NOT REMOVE ALL THE WHITE STAINS. DOES ANYONE KNOW A SURE FIRE CURE FOR REMOVING WHITE LIME STAINS FROM RED BRICKS? PLEASE RESPOND. M.J.B.