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If it's mold based, then my understanding is that borax or hydrogen peroxide are effective remedies. Soap is not very effective against mold. If you don't think it will damage the awning, I recom...
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If it's mold based, then my understanding is that borax or hydrogen peroxide are effective remedies. Soap is not very effective against mold. If you don't think it will damage the awning, I recom...