In the past I found a recipe on here for a awning cleaning solution. I have searched but cannot find it. Does someone know it? You mix it up, bleach, detergent and hot water and spray it on the awning then roll up for a while. I don't remember the amount of each ingredient.
I just spray the fabric with one of those kitchen/bathroom cleaners that has some bleach in it ... roll the fabric up for 1/2 hr and then rinse off. Been doing that for almost 30 yrs. Just make sure you use old nasty shirt because any water droplets will likely bleach your shirt.