Sorry, IMHO an old blade in an new fanatasy dress.
Cleaning the blade will not help much.
Often these blades are laminated, but with this heavy pitting it will never become a good looker.
Try the search function on this website for rentjong and/or rencong
There are several nice examples in various threads.
From tourist , to good old "Aceh war period"pieces and even "royal" examples.
Good luck
