Control Moss With Laundry Detergent : 4 Steps - Instructables- how to use washing powder on moss seed ,Step 1: Test Area. I mostly use the detergent treatment to control moss on the roof of my house. It's more than an appearance issue, moss shortens the life of shingles and causes leaves and needles to accumulate which contributes to leaky roofs. To illustrate how well detergent works, I treated a section of concrete wall next to my driveway.How to Remove Moss From a Roof With Detergent - SFGATEApr 27, 2021·s and Roofs and Stop it …- washing powder to kill moss on grass naturally ,Standard dish soap or washing up liquid. To apply it over a large area, the best tool to use is a s and Roofs and Stop it …- washing powder to kill moss on grass naturally ,Standard dish soap or washing up liquid. To apply it over a large area, the best tool to use is a maintenance, paying particular attention to the following: When seeding or laying a lawn in a shaded area, use a grass seed mix or turf specified for …