Go back to your original post and read my comment! Do you have TPO or EDPM or? They are very different in composition and require different care. Do some more research online as some products will do harm. It also depends on the condition and age of your roof and if it is stored inside or out. On TPO It may be best to wash it and nothing else. On EDPM a lot of people use Protect All.
"Got a dog for my kid, the best trade I ever made"
Bob, Rita and the better half of my trade, Pudgy
2011 Serrano, 2012 Jeep Patriot on tow dolly