Please choose the correct ending to complete the given sentence: Home and Garden: [header] How to polish quartz crystals [title] Use an old toothbrush to wash away clay or dirt. [step] You can do some initial cleaning of your crystals with a toothbrush and water. Make sure you wash the crystals outdoors, as clay and dirt from the crystals can clog a sink.

Ending1: [substeps] Scrub the crystal to remove set in clay. You will have to do several rounds of cleaning, allowing the crystals to dry in between rounds. Ending2: [title] Use a colander to wash the crystals in. [step] To clean your crystals more effectively, simply dump the crystals in a colander to wash. Ending3: [title] Warm, but not boiling, water to the right temperature and stir well. [step] Avoid heated water, which can damage your crystals' hardened state. Ending4: [substeps] Don't use any cleaners on your quartz crystals. You don't want to waste clay or dirt based cleaners.

Answer format: ending1/ending2/ending3/ending4