unknow sword

[asomotif]

another question is : must i clean them, and if yes, how?

Dear L'Audois,

Pakayun are rare. That is why you don't see much info on them , even on this forum. Ben / Dajak has a nice collection of them, and probably most threads you found concern his collection.
If you don't know how to clean them , in this specific case, i would say. Don't clean them. They don't appear to be in a very bad state.
So, just apply some oil to the blades, some bees wax / antique wax to the wooden scabbard and handles and let them be as they are.

These are excellent examples and will get only scarcer.

Saluts,

Willem