SoundGuy wrote:
I've always, except on one occasion, used awning cleaner specifically designed for the purpose, and with great results. The one time I tried that "bleach / water mix and roll up the awning" trick it irreparably damaged the awning vinyl which I then had to replace ... and that which dripped off the awning also destroyed the shirt I was wearing at the time. :M
You used too much bleach. 1/2 cup to 2 gallons water, and 1/4 cup dishwashing detergent is what I use. Wet awning with the mixture, roll up for 15 minutes or so, and then unroll and rinse.
If that doesn't get it all, then do it again and leave the mixture on a bit longer. Works like a champ for me, and my shirt didn't have any holes to boot. :-D