Guys , went on the roof for the scheduled "inspection" (4 mos. ) My TPO roof was covered with little gray spots (about 1/4" dia. ) !!!

Spic N' Span wouldn't touch it ... Felt around the roof all over , everything appears sound , caulk OK , although that's going to be replaced soon with Eternabond tape... No soft spots .... But all those Spots ... Got the roof cleaned , save those million spots ... Now wondering if that's normal or should I clean it with something "stronger" ??? Or coat it with some kind of special paint ???

Anybody else seeing Spots ???