I know this is going to sound horrifying. but when the kids were little my son got his favorite shirt wet and hid it. When I found it it was covered in mildew. I put cold water in the sink and put in a cap of bleach. Let it stand a while and scrubed it aginst it self between both hands. I have also done blankets this way filling the washer with cold water and 1 cut of bleach before I put in the blankets. Don't have pictures but the mildew came out and did not fade any of the color in the blanket.
Hope this helps, sorry for your lose