A car's windshield can be scratched by a flying bit of debris such as a rock or piece of gravel. Removing a scratch from the windshield yourself requires a few household tools, along with some hardware supplies and a glass polishing kit that can be purchased from an after-market car supply store. The procedure is straightforward and will enable you to render the scratch invisible -- saving a bundle of money compared to having this done at a car dealership or repair shop. Adult supervision is required at all times if someone underage attempts to do this, since a power tool will be used.
Mix the polish that comes with the polishing kit in a plastic container with the amount of distilled water specified in the instructions that accompany the kit. Stir the mixture with the wooden dowel.
Park the car in your driveway. Pour tap water into a bucket. Pour the bucket on the windshield to remove loose dirt and other contaminants. Wipe the windshield dry with a lint-free cloth.
Plug one end of an extension cord into a wall socket for power. Run the extension cord out to the car. Draw a rectangle around the scratch on the windshield with the grease pencil.
Attach the buffer to the power drill. Plug the power drill into the extension cord. Set the power drill to the "low" setting.
Apply the polish mixture from the plastic container onto the scratch with the soft brush, starting just beyond the left side of the scratch and then moving across the scratch until reaching just past the other end.
Press the trigger on the portable drill to start the buffer spinning. Place the buffer against the left side of the scratch and press down gently. Move the buffer across the length of the scratch to the other side. Reverse the direction to return to the side of the scratch where the buffer was first placed. Repeat this action another nine times for a total of 10 times back and forth.
Release the trigger of the portable drill. Inspect the windshield to see if the scratch has been taken out. If not, reapply the polish mixture and use the buffer again in the same manner as was just done.
Disconnect the power drill's cord from the extension cord. Remove the extension cord from the wall socket. Put the extension cord away.
Remove the buffer from the portable drill. Put the two of them away. Dispose of the remaining polish mixture properly. Clean out the plastic container with tap water.
Gently wipe off the grease pencil from the windshield with a clean edge of a lint-free cloth.