Hi Apolaki, please see the 2nd post in this thread by Alan -
http://www.vikingsword.com/vb/showthread.php?t=23934
Something I've learned is that a simple clean using dish detergent or cream cleaner and a hard toothbrush, under running water, can spruce the appearance of a blade up real nicely.
After a full clean and dry, you can drench the dry blade with WD40, let it dry, then repeat the process daily for a few days.
Once finished, you can use some fragrant keris oil to lightly coat the blade with using a brush. I use liquid paraffin and sandalwood (cendana).