Can I just clean/boil the bowl and blade of a Cuisinart or do I have to replace them for Passover?
Generally we should purchase a new food processor for Passover. This is because they are sometimes used with hot or sharp food that may be chometdik, and because they are washed together with chometz dishes. It is hard to really clean a food processor well in order to do hagalah on it, because it can have numerous crevices. Therefore it is advisable to buy a new one for Passover.
The Kosher Kitchen pg. 399.