How can I get that mildew smell out?

I have some beautiful wool blend slacks that were forgotten in the washer. Now they have the awful smell of mildew. They can't go in the dryer, have to hang dry & that just makes the smell worse! I have tried washing in vinegar but still when I get them out of the washer they have that terrible smell. I love these slacks & hate to throw them out. Please help!

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