Henk, I would suggest that when we use lime or lemon to clean a blade, it is easier, neater, cleaner and in all ways preferable to use strained and filtered juice together with a small, stiff brush, than to use raw fruit rubbed onto the blade.
Lemon juice should not be used in combination with warangan for the stain, as the result is never correct.
The inside surface of lime skin used under running water, after the juice has been removed, can be rubbed onto a blade if the stain has become too dark, in order to lighten the colour.
Yes, I've seen the little "o" used above a Javanese "a". I think perhaps the two dots were introduced because of some printing or typing necessity. An "o" above the "a" is certainly more indicative of the required sound.
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