I have a camper (tow behind RV) with an awning. Every time I unroll the awning/canopy it stinks. I have scrubbed it with soapy water, and left it open to air dry several time. But it always get wet and smelly again (presumably related). The material looks like a vinyl.
Keeping it dry and/or open for long periods is not an option. I suspect I need to apply something to the awning that will kill what ever makes the smell without destroying the awning.
Picture of the awning style. We upgraded to a slightly larger camper after this trip, so while basically the same they are not identical. The camper/awning pictured here did not have the issue in the few years that we owned it. The replacement is similar (different brand) and nearly the same age.
P.S. Notice that the rabbits in the photo, are in exercise pens (x-pens), have been treated for parasites/fleas and stay in the camper when not being directly supervised