Try a bit of bleach in the mix next time. I use a yard sprayer and a mixture of bleach, water, car washing soap. I use about a cup of bleach per gallon. Spray it on the roof and all plastic parts and let it stand for several minutes the flush with a hose. Seems to work well on my 15 yo rubber roof. Other than the spots, your roof looks great.
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Tom
2025 BTCruiser 5255
2021 Jeep Gladiator Sport Willys
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