The best way to fix scuffed Blundstones is to use a leather conditioner and polish. Start with wiping the boots down with a moist towel. Then, spread the leather conditioner all over the boots' surface. Give the conditioner at least 30 minutes so that it can absorb into your leather. Next, wipe off any extra conditioner from the boots using a dry cloth. Finally, apply a small amount of shoe polish to the scuffed areas and buff again until the scratches are no longer visible.