White Scum Presoak
White Scum Presoak is designed as a pre-soak to facilitate the quick removal of white scum on brick, block or concrete. Used in conjunction with NMD 80, this combination will ensure the complete removal of white scum. White Scum Presoak provides powerful penetration and softening action of white scum. First apply the White Scum Presoak undiluted and allow it to dwell on the surface for approximately five to ten minutes. Apply NMD 80 diluted four parts water to one part solution (4:1) without rinsing off the White Scum Presoak; allow a five to ten minute dwell time. Rinse completely to get the desired results.