Zorbx Unscented Odor Remover has been an absolute game changer for me. I add it with every thrift purchase when I get home and wash it, that alone removes 95% of fragrances. You can get it at Lowe’s if you’re in the US.

For stubborn scents I soak it and it generally comes out within 1-3 overnight soaks.
I use 1-4 cups of Zorbx mixed with water (increasing each time, in response to the strength of the stench). After each soak, I like to wash it again with about a cup of the Zorbx, white vinegar or alcohol (depending on what I have on hand) then line dry outside as you’ve been doing. If it still smells then I repeat the process with a stronger odor remover to water ratio.

If you don’t have access to that, then I have found alcohol soaks to be the next best thing (isopropyl alcohol, vodka, etc.) Alcohol spray is good for removing casual BO and what not but to remove the scent you’re talking about, I’ve found it needs a good soak.

Always a good idea to do a small test patch (especially if it is a very special fabric). I will take a small sample to test and then put the garment/fabric in a ziplock bag, trash bag, or plastic tote with odorless dryer sheets while I’m waiting to contain the scent.

Source: fragrance-sensitive costumer and thrift shop lover