Only matzahs baked especially for Pesach may be used on Pesach. This chomets should be sold to a non-Jew, as will be explained. Clean the entire house thoroughly to remove all crumbs and small pieces of food. Starting 'from scratch' All fresh fruits and vegetables as well as all kosher cuts of meat and kosher fish are kosher for Pesach - provided they have been prepared in accodance with Jewish law and have not come into contact with chometz or chometz utensils. Obviously, all leavened foods made from wheat, barley, rye, oats, or spelt are actual chometz and are prohibited on Pesach.
Examples are bread, cake, cereal, spaghetti, beer and whiskey.
Many medicines, sprays and cosmetics contain chometz. Consult a competent Rabbi as to which ones may be used on Pesach. The same applies to pet food. To do so, consult a Rabbi. Stove Thoroughly clean and scour every part of it.