Please choose the correct ending to complete the given sentence: Home and Garden: [header] How to clean quartz crystals [title] Use an old toothbrush. [step] If you have just a few quartz crystals or crystals that are only slightly tarnished by clay, you can use an old toothbrush to clean them off. Simply wet the toothbrush with water and scrub the quartz crystals in your hand.

Ending1: The crystals should come off with little effort, freeing them up of any residue. [title] Clean the crystals with baking soda and water. Ending2: The more intense the scrubbing, the more clay and grit you will add to your cleaning. [substeps] The abrasive method acts by tarnishing the quartz crystals, not removing the grime. Ending3: Pay special attention to : [substeps] Cracked or dyed quartz crystals leakage or melted clay crystals broken crystals [title] Remove any grime from quartz crystals. [step] Since quartz crystals are magnetic, they can lead to abrasion or scratching. Ending4: [substeps] You can even use scouring powder and a steel brush for tougher stains, as quartz is a very durable material. [title] Dry the quartz crystals in the sunlight.

Answer format: ending1/ending2/ending3/ending4