How do you get a smelly lampshade clean?

To clean a smelly lampshade, first, unplug the lamp and gently dust the shade with a soft cloth or a vacuum with a brush attachment. For fabric shades, mix a solution of mild soap and water, dampen a cloth with the mixture, and gently wipe the surface. If the smell persists, sprinkle baking soda over the shade, let it sit for a few hours, and then vacuum it off. Finally, allow the lampshade to air out in a well-ventilated area.