A few more things that do and do not need to be kosher for Pesach: Paper-ware and plastic-ware do not need to be certified as kosher for Pesach. (However, some do not use paper plates unless it is certified to be Kosher for Pesach. This is due to the fact that corn starch is used in the plate.)
Dish soap, strictly speaking, does not need to be kosher for Pesach but the prevalent custom is to use only kosher for Pesach dish soap.
Liquid cosmetics that contain alcohol, wheatgerm, or vitamin E, is a matter of debate. One may rely on those that permit using perfume, cologne, shaving lotion etc. on Pesach.
One last thing, although not typically eaten by humans but still must be kosher for pesach is pet food. (Pets may be fed food with kitniyot.)