Plenty of information already given.
I would say that it is indeed not recommended to use any abrasives on a finished kris blade.
Mild Acids are all going to do the job.
Etching, is optional, but is not an easy job but... you may certainly try the methods recommended in many threads here. If you have someone whom washes in Warangan over there ( we have a few in the NL) do that.
About preserving in a plastic sleeve with oil, in the NL this is not done, to my knowledge ( and I know quite a few collectors) . I don't think that in a normal British house this would be a requirement unless humidity is very high. Collectors in tropical climates may have different requirements but temperate climates don't, in my experience, require this.
I would add that this is a Maduran blade and sarong and that the hilt is showing in the opposite orientation. Its is normally (or it should be) only friction mounted with some cloth inside you should be able to gently ease it off and then when finished with cleaning put it in the right way.
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