A dime-store art-gum eraser works great for cleaning wallpaper. It will remove a lot of marks, especially those smudges around light switches. To make chrome fixtures (kitchen and bathroom faucets, etc.) shine in a minute, clean them with an old cloth dipped in kerosene. And to get rid of rust in the corners of such things as baking pans, scrub them with a cut raw potato dipped in scouring powder.