First, its good to ID the type of roof that you have: Rubber roof (AKA “EPDM”) membranes are smooth and will be slippery when wet. TPO roof membranes have a texture like an orange peel.
Basically, the roof needs to be cleaned with a non-petroleum based cleaner. Inspect the seals for cracks and use Dicor LAP sealant to touch-up (leveling for horizontal surfaces and non-leveling for vertical surfaces).
There's more information in our Library
for further reading about recommended cleaners and other items for each type of roof.
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