Fixing a DVD that has scratches on it requires filling the scratches. This is possible with scratch filler, sold in stores, or with household items like window cleaner, furniture polish or glass cleaner.
Many items are safe to use on DVD scratches by filling the scratch, then wiping them off. Some cleaners that work well include eyeglass cleaner, glass cleaner and window cleaner. Spray the scratches and let it soak into the scratch, then wipe away the cleaner. Baking soda toothpaste, metal polish and furniture polish also work well. Some food items, including banana and peanut butter, can also be used. Just be sure to wipe off the disc after filling the scratches.