Spray your furniture with an all-purpose wood cleaner. Wipe it off and give it 20 minutes to air dry completely.
Fasten a sheet of 80-grit sandpaper to the bottom of an electric sander. Run the sander across each piece of furniture, covering the entire surface area. Repeat with 150-grit sandpaper and 300-grit sandpaper. Wipe down the piece with a tack cloth to remove the particles from sanding.
Dip a 3-inch brush in the deep mahogany, ebony or cherry stain of your choice. Apply it to the wood, following the direction of the grain and covering it with a thick coat. Allow it to penetrate for 20 minutes and then wipe off the excess. Repeat this process two more times or until you get the dark shade you desire.
Allow the furniture to air dry overnight. Then dip a 3-inch paintbrush into clear polyurethane. Coat the furniture with a light coat of polyurethane; give it a full day to dry.