What type of awning do you have? Does it roll up from the "outside in" or when it is rolled up, is the material from the awning"rolled under" rather than "rolled out" on the roller tube? Kind of hard to explain, but if rolled under, it would catch any rain from the roof and it could be held in the rolled up awning. To clean it, use water and household bleach mixed 50/50 and spray or "paint it on top and bottom, let it set for 15 min, rinse it off with plain water. If still stained/smelly, repeat. You can also leave the bleach solution on the the awning, roll it up, wait 15 min, unroll it and rinse. It works very well but make sure you do not leave it on more than the 15 min without rinsing!
Brenda and John
'14 Ram 3500 MCSB 6.7L HO PullRite 16K S/G, Grey Columbus 320RS Camped '14 - 146 days/'15 - 196 days
USN-EOD(Ret), Master Chief, 30 yrs,
Master Blaster of the Navy