Question:

Can I kosher for passover my knife if it has a wooden handle?

Answer:

Technically you can, because wood can be kashered, however you have to make sure that there is no food at all between the blade and the handle, which can be very hard to clean out.

Best wishes

Sources:

O:CH 451-12, M:B 68.

Rabbonim of the Beis Hora'a