Please choose the correct ending to complete the given sentence: Home and Garden: [header] How to dull chrome [title] Purchase a plastic scouring pad. [step] Scouring pads can be purchased at most grocery stores or online. You can also use a very fine sandpaper from a hardware store to dull your chrome.

Ending1: You can polish chrome with metal scouring pads at home, or in an outdoor environment. [substeps] You can purchase scouring pads at most outdoor hardware stores. Ending2: [substeps] Be sure to use a medium grit to avoid dulling your chrome surface. [title] Scour your chrome with a thin scraping brush. Ending3: [substeps] Scouring pads can also be used to remove the greening of chrome. [title] Press the pad against the chrome and scrape it in one direction. Ending4: However, it should not be used for under 10 minutes. As this abrasive finish can severely sand chrome, be extremely careful not to use it for longer than 20 minutes at a time.

Answer format: ending1/ending2/ending3/ending4