David's comments pretty much echo what I am thinking.
If I wanted to lift the appearance of this wrongko I would do this:-
1) Remove the pendok. If it does not slide off easily, gently heat the back of it, for this heating I use a gas torch turned right down low, because I can precisely direct the heat, but any source of heat will do, just be careful not to get heat directly on the exposed wood.
2) The problem with the pendok appears to be that a slorok --- the contrasting under layer that can be seen through the pendok open-work --- has been fitted, but fitted very untidily and without making room for it by scraping down the back of the gandar (the long section enclosed by the pendok). Fit the slorok so that its edges do not protrude beyond the edges of the pendok, and remove sufficient wood from the back of the gandar to permit a tidy fit. Easiest way to remove wood from the back of the gandar is by scraping with a small blade.
3) Polish the pendok with a Scotchbrite pad, and finish polish with 0000 steel wool and then an impregnated polishing cloth. It is very difficult now to get polishing cloths specifically for brass and bronze, but a silver polishing cloth will work OK. You can use various grades of steel wool instead of a Scotchbrite pad, but if you use steel wool be very, very certain to get rid of any residue. Don't forget to polish the slorok.
4) Clean the wooden scabbard with a good quality furniture oil, not a wood finishing oil, but the sort of furniture oil that is used on fine furniture, allow to stabilise well after polishing, then use a good quality furniture wax and polish.
5) It might be a good idea to clean out the inside of the scabbard while you're at it, a rifle cleaning rod with .22 bristle brush is good for this, followed by blowing out with compressed air.
6) Put the scabbard back together making sure that it all fits together neatly.
For the hilt:-
1) Remove hilt; you might have some problems with this, if it does not twist off relatively easily tell us and we can pick that problem up later
2) Hand-rub the hilt with a couple of drops of baby oil, brush out the carved sections with a hard tooth brush.
3) Soak the mendak (hilt ring) in white vinegar then brush vigorously with a toothbrush under running water to remove the loosened tarnish and dirt and residual vinegar.
For the blade:-
Probably just a spray with WD40 followed up by application of a light machine oil. Allow to drain off before replacing in scabbard. Actually there are much better ways to long term store a keris than this, but if you wish, that can be addressed later, or you can just trawl back through the old Forum posts, I think this blade storage thing has been gone over a number of times.
Tuban Blades
The very large, old Tuban blades were more than big enough to permit a normal sized keris to be carved from them.
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