Pesachim 19 - Hand washing, why?

Matmonim: Daf Yomi by Rabbi David Lapin - A podcast by Rabbi David Lapin

Hands are treated uniquely in Halacha and we wash them a lot! We wash in the morning, for davening (prayer), before meals, after meals, and the Kohanim wash their hands. Is it for cleanliness, or for sanctity?