Sliding glass doors can get scratched in a number of ways, often without the homeowner even being aware of how the damage occurred. Scratches can be made by pets or by human activities. The unsightly marks make a sliding door look old and uncared for and reflect badly on the rest of the house. Hiring a professional to remove scratches can be costly. Fortunately many scratches can be removed by homeowners themselves, using easily-obtainable materials.
Wash the area of the door with the scratch using an ammonia-based window cleaner and paper towels or a rag.
Run your fingernail across the scratch. If you can't feel the scratch or only barely feel it, it is probably shallow enough to remove. If you can feel the scratch with your fingernail, the scratch may be too deep to remove completely using home remedies, and may require the assistance of a professional to buff it out.
Place a small amount of Jeweller's rouge (available at most jewellery stores and many arts and crafts stores, as well as online) on the lamb's wool pad of an electric buffer and buff the scratch on medium speed for two minutes. Use firm but gentle pressure, being careful not to apply so much pressure that you break the glass. Wear eye protection as you buff.
Clean the area with an ammonia-based window cleaner and paper towels or a rag and see if the scratch is still visible. If it is, buff it a second time using additional jeweller's rouge on your buffer pad. Again, buff with firm but gentle pressure for two minutes.
Clean the area again with window cleaner and a rag or paper towels. If the scratch is still visible try to buff it out with jeweller's rough a third time. Clean the area again following your third buffing attempt. If the scratch is still visible then it may require the services of a professional.
Whitening toothpaste may be used in place of jeweller's rouge. Do not use a gel toothpaste--use white toothpaste. Never use an abrasive cleaner to buff out a scratch as these can leave behind even more scratches. Scratches can be removed by hand. Place Jeweller's rouge on a soft cloth and rub in a circular motion using moderate pressure. Try hand buffing up to three times before calling in a professional.