From the looks of it, this is a keris from Solo.
Try using sewing machine or any other kind of light neutral oil and a fine toothbrush. Give the blade a thorough brushing. use clean rags/tissue paper to clean off the rust (blot, not rub). Repeat oil-and-brushing until the oil blotted off no longer has rust in it (i.e. no longer brown/red).
Once this is done, you only need to clean the blade about once a month (assuming you keep the keris in a cool dry place).
There is a good possibility that this may not get some of more deep-set rust out. In which case, you might want to get in contact with of the more experienced collectors who can help you with cleaning the rust using more 'caustic methods'.
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