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Well, it depends. If the smell is in the dirt, itself, just because it's in a crawlspace, then you may need to 'encapsulate' the dirt. If, however, the smell if from the 'rotting stuff' that leaked into the dirt, then by removing it, and replacing it with 'fresh' dirt may help.
I'm not sure if pouring any type of 'chemicals' will work. I think you need to excavate the 'bad dirt' and replace it w/fresh dirt. The way to keep the crawlspace 'clean' is to ventilate it (assuming you're leaving it as a dirt crawl.) This will help to dry out the TOPmost portion of the dirt. You can start by introducing a dehumidifier to see how it goes. Beyond that, you need to cover it w/6 mil poly or concrete.
My best to ya and hope this helps.
Jay J -Moderator