I'll second the freezing comment. I've never had to deal with mold on my hash, but I had a buddy lose a bunch of good product to a seriously bad mold infestation a few years back and he turned all the moldy stuff over to a friend who froze it then made bubble hash with it. I can testify, I went through grams and grams of that hash and it was fine.

I would use the freezer method and then hit it with a 15 second grain alcohol wash.

hmmm... thats a bit sad bro.
i smoked some mouldy greeny hash shit once, it was ok just tasted a bit stale kind of, i tried putting it in the freezer but only a bit came out