Clean kitchen cabinets: mix 1 part vegetable oil & 2 parts baking soda. Scrub with a toothbrush. Remove rust spots from kitchen knives: soak in lemon juice. Return air vents: apply a layer of wax to them to help repel dust. Shower walls: fill a dish wand with half vinegar and half Dawn dish soap. Scrub the walls with the wand then rinse.