Speaking of clean-up, I once was working on a very dirty and dusty
piano action.  I took it to the local gas station that had compressed
air and asked the owner (a friend of mine) if I could use his air hose
to blow out the dirt.  He was enthusiastic and changed the end fitting
to a small one that focused the air to quite a blast.

Not only did the cobwebs, dirt, and dust get blasted away, but the
hammers cleaned up like new.  Since they were still soft, no
replacements were made.

Bill Chapman
Palms Springs, CA