What does fresh epdm look like?

I only used the acetone to wipe areas with a rag that I was re-caulking. The thickness of the layer of gray chalk made it almost impossible to get clean. And it all collected on the dicor sealant too which was super dirty and hard to clean. Now with extremely little elbow grease it's all squeaky clean rubber. I do so wish I had cleaned with this stuff before recaulking last summer - would have saved me hours and come out cleaner.

Anyway - the varying color around the roof is really odd. It all feels the same - not like it's obviously breaking down in one area or the other. I guess time will tell.