How can I safely clean a large canvas awning?
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Try spraying it with simple green or a shower spray that cleans your shower.
My guess is that mildew is causing the staining. Consan Triple Action 20 will kill the mildew there and if applied regularly will not return. It is water soluble. Mix 2 T to a gallon of water.
It looks like a Sunsetter and they make a cleaner specifically for that problem that will not harm the fabric. Go online.
Spray a solution of oxyclean.
Norwex makes stain remover - non toxic enzyme based.
I agree with the previous post. Do not use a bleach product, as it will deteriorate and weaken the fibers.
I had an old patio umbrella that I spray painted and it held up for years!! Covered all the old stains and gave it a new lease on life! You could try Wet n'Forget to remove the mold stains -- easy peasy, just spray it on.
I used white vinegar and water in a spray bottle and a scrub brush. It came beautiful!