Awful stench

The design is nice and crisp, but the fabric has the most repulsive odor about it. My husband says it has the smell of blood, that tinny smell that gets ya in the back of the throat. I've laundered 3 times and used fabric softener, both of which did nothing for the stench. I live in FL, so I've had it out in the sun for several days now. Still it stinks. Any tips on what the odor is and how to kill it? I can't bring it in the house as the smell permeates the air and makes you want gag.

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