Trapper gives great advice.
Removing from the stock , and letting the action soak ( gasoline,mineral spirits, Coleman Lantgern Fuel is what I have done. Air hose, lube, air hose to spread lube around.
I broke a H&R in 28 ga once in my "T&E" err..days. [ don't ask] - H&R was very nice, and prompt about the Repair when I sent it to them.