I was just recently able to save one that came in with brown slime disease.
First thing I did was dipped it in a solution of revive. I also took a turkey baster, and sprayed all the dying tissue out of the skeleton. I figured it was going to die if I did nothing, so I squirted it as hard as I could to get as much of the dead tissue out. Then with my bandsaw, I cut the dead portion of skeleton, and made sure to cut into the healthy flash to remove all Dead/dying flesh. After making the cuts on the bandsaw, I took super glue and superglued all of the flesh that I cut, and I made sure to squirt a little bit of the glue into the skeleton.
It has been doing great ever Since