This roof had not been cleaned--ever! Been more than 5 years. It was black.
It gets very hot here in South Alabama as well, so started about 6:15AM took about 2 hours.
Here is the results after one gallon of Mold Armor and using a truck washing brush to scrub the surface. I was going to get another gallon but Home Depot was out of it. It really did not do very well on the area that had the heavy sealant on it. Perhaps it will come completely clean with another effort.
I hope that another gallon cleaning will product the best results.
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Lots of miles before I rest!
Jim Johnson
2018 Ford F-250 SuperCab 4X4
2016 Wildwood X-Lite 241QBXL