I found a great stash several weeks ago that was terribly mildewed
http://www.quiltingboard.com/t-120833-1.htm
I found washing with detergent, white vinegar and a heavy solution of baking soda and water, and then a very hot dry was the trick. It still smells when coming out of washer but the hot dry solved the problem. I have just finished pressing this huge stash.
Good luck with your reviving your stash.