To be safe, test your stain on an area that isn’t visible on the furniture to make sure it’s the color you really want. Then apply the stain all over with an old (but clean) T-shirt or cloth. Wear latex gloves so you don’t stain your skin. Be generous with the stain, just whipping away the excess when you’ve covered the whole area. Depending on how long the item has been outside, it may drink up that stain and require a second coat. Let it dry for an hour or so before deciding on a second coat.