BTW, working on old calabashes, I think was from 1911, can be tricky. When I started to clean this up so I could figure out the level of restoration, it literally exploded in my hands.
View attachment 155850
Wow!!!
I hadn't anticipated anything like that when cleaning, but I'll certainly be more careful in the future.
Regarding the cleaning of fixed-bowl gourds, I used alcohol on one recently and didn't get great results, but a lot of gunk came out, so that's better than it was. I just poured alcohol in through the mortise until it just showed in the bottom of the bowl, then emptied out a little, closed off both ends and shook. Did that several times, then let it air out for a while. It would probably be okay to add the alcohol, plug the mortise and just let it sit for a while, but I'm unsure whether or not soaking would damage the gourd.
Any ideas are appreciated - the only thing I've found by googling, is that fixed-bowl gourd calabashes can't have their internals cleaned other than scrubbing out what you can reach of the mortise.