it's simple kev...I take a gallon of well water, add 1 tsp. of potassium bicarbonate and a spritz of dawn dish soap...mix well and hose the plants down, bottoms and tops...after a good soak I repeat and let dry before bring them back indoors...the PM sheets off the plant and rarely leaves any residual...it kills all pathogens by making the plant very alkaline but the PM can come back...constant diligence is needed once it comes into your garden...What did you use and how did it work. Can you still see the mold (white powder) or does it dissolve/wash off.