Hi there. While cleaning in our garage with my mom recently, we unearthed several porcelain dolls my grandmother bought for me when I was born. While all the others were in relatively good condition, one unfortunately was not and that was the biggest one.
She is an American Artists Collection doll named Jonette Nicolina and is 25" tall. Here's a picture of her after we pulled her out of the garage. 
Over time, water seeped into the bag and the box and ultimately mildewed the right side of her outfit (visible slightly in the picture).
This doll means a great deal to me as my grandmother is the one who got it for me so that leads me to the title question. Does anyone know any special tips and tricks to cleaning mildew stains out of old doll clothes?
I tried to do a bit of research beforehand, but there isn't really anything specifically talking about mildew stains and the ones she has are pretty bad.
Any help is greatly appreciated. 
Thank you for the answers!
Atm she's in our garage in a plastic tub on her own while we figured out what to do with her. The cardboard box she came in was completely ruined by water damage so it had to be thrown away. When we get the chance to go back out, I'll bring her inside. I'll also have the chance then to get better pictures of her.
The mildew stains show up very dark on the light fabic so I'm pretty sure getting the entirety of the stains out will be pretty much impossible; I'm just hoping to significantly fade and cleanse it so it isn't as noticable. The mildew starts just above her right hip (on the sash) and extends down the length of the dress to the bottom.
Her dress is actually light mint green and white and seems to be mostly organza if it helps. In the mean time while I'm not able to get pictures, this is what the doll looks like in good condition (not my photo, source is here). It's a very poofy dress with layers of sheer fabric/organza with lace trim.
