Best way to clean awning to get rid of mildew smell?

The roll-up awning on my 2011 Zinger Camper is in very good shape, but at one point the previous owner must have rolled it up wet…..and stored it for a long time. Every time the family and I take the camper somewhere and put the awning out….it reeks of strong mold and mildew smell.

I’ve tried a few different awning cleaners on it, scrubbed the heck out of it…..and even though it looks very clean with only a few light stains from the mildew remaining (I just can’t get those stains off)…..it still has that mildew smell to it.

Are there any tricks for getting rid of that smell? Any special cleaners that will give it a nice deep clean? What about power washing it…..too rough on the awning?

Any advice would be great.