I found this on Google hope this will help : is possible to repair scratches with some simple products that are easily available at home. Let us have a look.
We know that nail paints are for decorating your nails, but they can also be great to repair scratches on glass. For this purpose you must use a colorless nail paint. Apply a thin coat of nail paint on the scratch and set it to dry. The excess nail paint can be cleaned with a cloth. You can also use a nail paint remover for cleaning the excess nail paint after it has dried.
Metal polishers like Brasso are also effective in repairing scratches from glass. Put a few drops of Brasso cleaner on a cloth and polish the glass surface with it. Repeat the process a couple of times. Brasso helps in repairing the scratch on glass by reducing its prominence.
Toothpaste can also help in the repair of scratched glass. But you must make sure to use the non-gel type. Cover the scratch with a coat of toothpaste and set it to dry. Once it hardens, clean it with a cloth. This should help remove the scratch. This will be helpful in repairing scratched glass of a table top or window.
If you are thinking of how to repair scratched glass of a windshield, try a glass repair kit, which can easily be bought at an auto parts store. It is easier and safer to use. But let a professional manage the deeper cracks.
If you wish to repair scratched sunglasses, try using Armor Etch. Although it is used for etching, it is also used in repair of scratched glass. Put some drops on a piece of cotton or cloth and apply it on the glass. Let it set for a couple of minutes and then wash it with water.
Mix equal amounts of dry mustard and white vinegar into a paste. Spread this paste on the scratch and allow it to dry. On drying, wipe off the paste with a cloth.
Jeweler's rouge can also be used to repair scratches from glass. Apply some jeweler's rouge on a cloth and buff the scratch. Although jeweler's rouge is expensive, it can help in repairing scratches on glass.
If the scratch in the glass is deep and you aren't sure of how to repair scratched glass, then it's better to seek professional help. Sometimes the scratches are beyond repair and the only way out is to replace the glass. Also, you must take as many precautionary measures as possible to prevent the glass from scratches, for e.g. drape the table top with a cover. It is better to have the scratches on the glass repaired as soon as possible to maintain it's sheen.