To remove scratches from mirror surfaces, first determine scratch depth by running your fingernail across it—if your nail catches, the scratch may be too deep for DIY repair. For light surface scratches, apply non-gel toothpaste or cerium oxide polish to a soft, clean cloth and rub in circular motions over the scratched area for 30 seconds, then wipe clean and buff with a microfiber cloth. For slightly deeper scratches, create a paste with baking soda and water, apply using the same circular technique, then clean thoroughly. Commercial mirror polishing compounds specifically formulated for glass repair provide more effective results for moderate scratches. Very fine steel wool (0000 grade) used with extreme caution can address stubborn scratches. For valuable or antique mirrors with significant damage, consult professional glass restorers as DIY methods risk damaging the mirror’s reflective backing.