Credit: Alexandra Rowley

Solution: No single method works on all items, so experts say you must first test-treat a hidden spot. Chris Moore, owner of Artbag, a leather-restoring shop in New York City, suggests dabbing the area with a little distilled white vinegar to swell the scratch (think handbag collagen). Let it dry, then buff the item with a colorless shoe polish. Bold souls might venture to carefully fill in a scratch with a felt-tip pen in the same color.