Clean your iron bed frame. Remove loose dirt and dust with a slightly dampened cloth or household sponge. Make a mixture of one cap of mild detergent or dish soap and warm water to clean more soiled areas. Rinse and wipe the bed frame dry with a clean paper towel.
Sand the bed frame lightly with fine-grit sandpaper. You want to thin the existing paint color and remove any sleek finish. Don't worry about sanding the bed evenly. A rough texture or splotchy look simply adds to its distressed appearance.
Paint the bed frame according to the directions on the product's label. Allow the bed to dry completely.
Sand the bed frame to allow the underlying coat of paint to peek through the new coat. Focus your sanding efforts on areas that would naturally receive the most wear, such as around the bed knobs, feet, edges and any raised detail work. Wipe off any loose paint particles with a clean, damp cloth.