Many of you who attended SWP in 2014 will reminder the lab that Pat Clrak and I did on the church roof! It was an EPDM roofing material. We are in the middle of another sub room here in Tallahassee.It is located om the compost of Florida A & M university. Cleaning great and easy. if you ever have a chance to clean one, go for it. Using a 1.5 - 2.0 mixture.