> We have been making elderberry wine for years.
> During and after primary fermentation we end up with a non-soluble goo.

I've not made elderberry wine myself, but I've heard of the
"elderberry goo" problem. From what I understand, you can reduce/
eliminate the problem by only using ripe berries. For cleanup, use
vegetable oil, then clean up the oil with a grease cutting detergent.

Erroll
http://www.washingtonwinemaker.com/