Here is a neat trick for cleaning between the hard to get at area between the top of the forcing cone and the bottom of the top strap:
Wet a sharp single edge razor blade with some solvent and hold it at a very acute angle against the bottom of the top strap. With one or two slow passes, it will remove 99% of the lead. To complete the job, take a rough white cotton shoe lace (from a sneaker) wet it with solvent and work it back and forth a few times, - lead is gone!
PS: Don't laugh too hard when your wife wonders why her sneakers no longer have their laces!! (LOL)
Regards,
chief38