You can take the stock off the action by removing the buttplate, and accessing the long bolt in the hole in the stock-I think you need a long screwdriver for that gun, shine a flashlight beam down the hole to see what you've got. Once the wood is off, simply soaking the action in a pan of mineral spirits, while gently brushing the crud you find will clean it nicely. Either allow it to air dry, or blow it a bit with compressed air. Allow it to dry over night, and sparingly lube the works with a good gun oil-I gave mine a shot of spray CLP, allowed the excess to run off, blew it a bit with compressed air, and installed the stock the next day.
You don't need to disassemble the trigger group, especially if it is a rare, single trigger gun. Everything you need to clean is right there.
Good Luck.
Best,
Ted