Clean those cookie sheets! Put 1/4 cup baking soda in bowl, add just enough hydrogen-peroxide to make a paste. Doesn't take much elbow grease to remove stains! For tough jobs, leave paste applied overnight.
I started doing this and will never stop! My tub & shower are always spotless-so simple. Simple shower and tub cleaner: fill wand half and half. Wet surface and scrub. wow! leave in shower & wash while you are already in there