Possibly shellac; it comes from India /S.E.Asia.
Possibly Tung oil; it also is from the same area.
Looking at your first handle it appears to me that it was dull from age rather than dirt. The second Barung looks like it has a nice patina from what I can see in your pictures; were it me I'd leave it alone and just polish the silver. the scabbard I would also just leave alone; I doubt it was highly polished, but there is only so much you can tell without the sword in the hand.
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