I have used kerosene for most of my life and never seen any negative results.
Try this cleaning first it fixes most of the problems I have encountered.
As for disassembly, many years ago the gunsmith I used told me never again when I brought my sentinel to him. There more tips and tricks to this revolver that he has never learned. You may find a High Standard smith but be careful of the guy that says he can fix anything. My Sentinels and Double Nines have never broke or needed repairs just really good cleaning.