If you have a portable cooler that has the odor of rotten meat, you can open it and clean it. Leave open to the sun for at least a couple of days with the opening facing as much of the sun as possible. This will get rid of most or all of the odor.
By B J Bartlett from Central Florida
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If you're cooler is smelling a little funky, wet a paper towel, wring it out, add a few drops of vanilla, then put it in the cooler overnight.