Glass doors are very susceptible to scratching, whether it is your front door or patio sliding-glass door. Any glass door that's used a lot--especially when you are frequently carrying something in or out the door--will eventually get scratched. But you can remove most minor scratches easily and inexpensively--and avoid contracting with costly professionals.
Circle the scratches on the opposite side of the glass door using the crayon. Clean the scratched surface of the glass door of dirt, dust or anything that could be picked up with the buffer.
Cerium oxide is an extremely fine powder used by glass companies and by jewellers to polish gems and stones. To locate some, try local glass retailers, larger home improvement stores, some auto parts supply stores (that carry auto body repair materials), or shop online (try such sites as www.ebay.com or www.jcwhitney.com).
Attach the flat buffer attachment to the electric drill. Mix the cerium oxide with enough water to make a paste. Apply to the felt or leather buffer pad on the buffer attachment.
Move the buffer back and forth across the glass door scratch with the electric drill set on high speed. As you use the buffer, keep the surface damp by spraying it with a spay bottle filled with water. Continue to buff the glass until the scratch is gone.
Clean the area thoroughly with alcohol before moving on to the next scratch on the glass door. Buff the area with a paper towel to remove all residues.
There are different grades of cerium oxide available. The optical grade is 90-percent cerium oxide, but you can purchase 99.9-per cent cerium oxide, which is more expensive. If there is a way to lay the glass on flat surface, it will allow you to apply more force while buffing out the scratches without stressing the glass surface as much.
Wear protective glasses and rubber gloves. Keep the pads free of debris, because they could cause more scratches on the glass.