You're distraught. That set of dishes you just bought and used once had unsightly marks from cutlery. Thankfully, there's an off-the-shelf cleaning solution.

Simply sprinkle a light layer of baking soda over the streak, and buff it out with a damp, non-abrasive sponge. If a powdery residue remains, you may need to mop or wipe your floors with fresh water.