It is very hard to beat household ammonia as a cleaner. I still rate it better than anything for cleaning old wooden tools which have grime and wax and proably oil embedded in them.
I would start with something like a toothbrush and a bit of webrax, a cupfull of ammoina and patience. Don't get the wood too wet and have a plentiful supply of cloth and/or loo paper/kleenex to dry it off periodically.