Thanx for the info. I have not used my guitar (rosewood neck) for over 20 years and used 0000 steel wool to clean the frets, then the neck (following the grain). Wow! What a difference. The key was moderation. Now, I wil use a clean rag to wipe it down after every session. I remember now about the calloused fingertips.
Thanx again,
Ter