Bird poop on sunbrella awnings

Hey guys and gals, got a restaurant with sunbrella awnings. Simple bleach and water mixture cleaned the algea off just fine but there’s one area that has some serious seagull poo on it that I just could not budge. Any tips on getting it off there?

Hot pure water or regular hot water.

Dwell time. Remember, it’s sun baked like a stone fossil. Soak, wait ten minutes. Do this three to five times. I call this the principle of the multiple pass. Then deal with staining. Have fun.

Have you tried this product? The problem with using bleach is it can weaken the stitches.
https://shopwindowcleaningresource.com/winsol-deep-clean.html