For my EPDM and my fiberglass roofs, I use a worn-out RV wash brush w/ 6' handle, a 5G bucket of water with the correct amount of SpicNSpan, and a few oz bleach. My roofs come out very white, no black spots of mold/mildew, bird droppings, grease,etc. I can stand the entire time, a good thing for an old man with bad hips.
Dicor used to recommend SpicNSpan for their EPDM material until they began selling their own brand of cleaning, preservation products.
2000 Winnebago Ultimate Freedom USQ40JD
, ISC 8.3 Cummins 350, Spartan MM Chassis. USA 1SG, retired;PPA,Good Sam Life member."We the people are the rightful masters of both the Congress and the Courts - not to overthrow the Constitution but to overthrow men who pervert theConstitution. "Abraham Lincoln"