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One option you could try is to soak the down jacket in a solution of warm water and baking soda. This can help to neutralize odors. You can also try using a laundry detergent that specifically targets odors. Additionally, you could consider using an enzyme-based cleaner to help break down the sweat molecules that are causing the odor. Finally, you may want to consider airing out your jacket outside or in a well-ventilated area to help the smell dissipate.