Use The Following Materials
sandpaper(various grits) handsander water milddetergent aluminumpolishing compound buffingcloth lintfree cloths aluminumsealer railingcover
Clean And Sand The Railing
Remove dirt and debris from the railing with soapy water and a lint free cloth. Dry the surface off with another cloth. Inspect the railing to locate all of the scratches. Dampen a piece of fine grit sandpaper with water and add a few drops of detergent to it. Damp paper works best, because it will provide enough lubrication so that the paper moves smoothly along the railing's surface. Attach the paper to a hand sander.
Run the sander firmly over the scratched areas. Check periodically to see if the scratches are fading. If they aren't, use a more coarse piece of sandpaper. Sand the aluminum until the scratches are gone.
Polish The Aluminum
Apply a small amount of aluminum polishing compound to a buffing cloth. Rub the compound on the railing's surface. Add more polish to the cloth if needed. Continue polishing the aluminum until it has a reflective surface that shines. Dampen a cloth with water and wipe the railing's surface so that any compound residue is removed. Dry the surface with another cloth.
Protect The Surface
To prevent scratches from appearing in the future, apply a coat of aluminum sealer. This product can be found in home improvement centers. Apply an even coat with a clean, lint free cloth. Once the product has been rubbed into the surface, the railing will have the protection necessary when subjected to adverse weather conditions. Reapply polish to the railing when it becomes dull. When you add the polish, make sure to apply a new coat of aluminum sealer as well.
You can also purchase a railing cover to protect the aluminum. Many cover styles are preformed and can be quickly wrapped around the railing. Measure the diameter and length of the railing on your deck and bring this information with you to a retailer when you are ready to purchase one. Taking good care of the railing will give it a beautiful appearance and will prevent future damage.