Pak Ganja, removal of a firmly fixed hilt is not usually a problem.
If you use a candle or small kerosene lamp for the heat source, there is no possibility of doing damage to the hilt, provided you are reasonably careful.
I suggest that you should work with bare hands, so that you can feel how hot the blade and hilt become during the process, this will safeguard against over heating.
I can understand your caution with attempts to remove the hilt on this keris. I have had two Palembang tangs break while attempting to remove a rusted on hilt. I suspect that perhaps the adhesive that they used to use in that area may have had a corrosive effect.
If this were my keris I would try the heat first, but I would not exert excessive force in trying to twist it off.
If you are bound and determined not to remove the hilt, the blade can be cleaned by repeated brushing with a mild acid, and rinse with water. Freshly squeezed lime juice will do it.
It would probably be a good idea to coat the selut with nail polish, and to wrap the hilt with plastic cling wrap before you start. The nail polish will come off easily with acetone, when you finish the job.
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