canopy pollen stains

[newpony1]

Unfortunately some poplar pollen/seeds not sure which stained the canopy of our palomino colt tent trailer. From the inside you see yellow blotches. Aesthetically, not the best. Any suggestions for trying to clean it? Pressure washer? Do you clean from inside as well?
Thanks

[strut526]

I used the magic eraser to clean the underside of our awning. Works great! Got the off brand from the $ store..