Beginner questions about dulcimer care
Instruments- discuss specific features, luthiers, instrument problems & questions
Welcome! Warren is a great resource and still building a few instruments a year at his home shop. He'll happily answer your questions.
I would leave his instrument tuned DAA or Ddd, and have your other instrument with the 6+ tunned to DAd since it was probably built with that tuning in mind.
A wipe down with a damp rag is the perfect cleaning process.
One thing to note is that when changing strings we almost never recommend stripping the instrument 'bare' as you called it. The reason is that if the instrument has no mark or slot where the bridge is supposed to go, it can be a real pain to get it back in the proper place so the instrument sounds correct -- the distance between nut and fret is critical to within a millimeter or so.... Better just to get in the habit of removing and replacing one string at a time.
updated by @ken-hulme: 01/02/24 04:00:00PM

It also didnt help anything that my first dulcimer had a 29" vsl. Still, I played it and got used to big stretches and then I started making dulcimers with smaller VSLs. I was able to make much bigger stretches much more comfortably.