This was @ a strip mall. So there are different companies there for different units all the time. I'm thinking it was another co that drew attention to it. Plus there is a roof hatch so access is pretty painless. Either way, someone was in a hurry and made us look like fools.
"The most common types of rubber roofs are Modified Bitumen, both Coated and Uncoated, and EPDM-Type roofing. And the only one of the three that would be a concern is the Coated Modified Bitumen as it contains fibrated aluminum. Therefore, those cleaners that foam and brighten (destroy) the aluminum fins or those that are quite strong in concentration should not be used on this specific type of roofing material. Instead, cleaners like regular CalClean or Tri-Pow'r should be used..."