I highly recommend Hertel Plus Disinfectant to clean your awning.
My Mom had recommended Hertel Plus to me when I saw how dirty my awning was after the first winter I had it. (It's stored outside with no cover.) Not only was it filthy, but there was the beginnings of mildew growth and brown staining. That first Spring I couldn't find the product anywhere so I tried a bunch of different products. Diluted Javex was the most effective. I finally found some at a large Home Hardware store while on a camping trip in Gananoque last summer. So, when I pulled the Roo out of storage this Spring and it again looked ugly like it had the first year, I got out the Hertel Plus bottle. I sprayed it all over the white underside of the awning. Using a medium bristle brush and soapy water, the dirt and mildew came right off and it looks nearly new!
I'm completely impressed with this product and highly recommend it.
Home Hardware - 700mL Original All Purpose Cleaner
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2023 Rockwood Signature 8262RBS
2016 Ford F-250 XLT SuperCrew, 6.2L, 4x4, 6'9" bed
2019 Rockwood Signature 8290BS (2019 - 2022)
2011 Rockwood Signature 8293SS (2015 - 2018)
2010 Rockwood Roo 23SS (2012 - 2014)