I wouldn't do anything to the roof except wash it once a year and check for leaks. You need to either read your manual or go online to the manf site and see what their recommendations are for maintenance is for your particular roof.
This is the recommendation for EPDM from their roofing site.
8. Does EPDM require systematic maintenance or additional coatings or treatment to achieve its life expectancy?
No. No special coating or other surface treatment is required. General maintenance in the form of good housekeeping should periodically be performed to remove debris and leaves, and to investigate the performance of other components. - See more at: General Questions | EPDM Roofing Association