Here's a real challenge for someone

[Dave S]

Originally Posted by bandersen

I think it's some type of soy based plastic that can go moldy

It's not mold. It's the plastic decomposing. (Mold doesn't easily even grow on plastic, although that set looks like it might have been somewhere where anything could grow!) There are a couple of threads here and elsewhere on the subject.

We had a young member of our club who had a lot of time -- and probably a lot of stubbornness -- who cleaned up a Predicta that was even worse than this one and it actually came out pretty good, so don't write it off as a parts set yet, but it would be a LOT of work.