Yes, sand them with an orbital sander starting with 40 grit disc’s. Go back over it with 60 or 80 grit disc’s and then apply a LIGHT color stain and clear coat. The best place to buy the disc’s is Lowes in 25 or 50 packs. The black ones will go further but cost a little more. Call 800-564-2987 for help with the stain selection.