While in TX, we developed that black mold. Once we got here in AZ., DW suggested I use Chlorox bleach GEL. It worked great! Just start on the lower end, spray an area no bigger than 2 sq ft., at a time, wipe the mold off - very little rubbing necessary. I hosed it down good as I moved up the awning.
Alan, Kathy & Cooper the camping cat
2014 Cedar Creek, 36CKTS
2013 GMC 2500 Denali
Full timers since 5/30/2013