I have found an ozone generator to be very effective at eliminating odors.
Enerzen Commercial Ozone Generator 6,000mg Industrial O3 Air Purifier Deodorizer Sterilizer (6,000mg - Black) https://www.amazon.com/dp/B00JAP7388/ref=cm_sw_r_cp_api_APkYBbVAHFTS5
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