Builder,..I tend to agree with Keith, if your gun only requires partial cleaning then something like varsol would do,..you don't want to get this stuff and water in someplace that you might not get out,... this is what I would use on a gun with 100 years of crud on it, anything that requires a partial cleaning is probably clean enough to just be oiled and left alone.
I know guys like to tinker but the tinkerers are the ones that we as lovers of fine old guns curse under our breaths when we see fine old Parker with buggered screws
I'm sorry if this is not what you wanted to hear but I don't want to send out the wrong message
Like Keith said,... Even a master stockmaker would be wise to leave engraving to a real engraver.
Italian SXS. I know it works on wood as well but since I have no way of knowing how deeply it's absorbed by the wood to perhaps be released later on to the metal I rather not use it
CJ