Water is the best universal cleaner. If you have access to the ocean, the ocean water is brilliant. If not, spring water, lake water and filtered water can also work well, provided the water is straight from nature or clean (filtered properly). Some people also add salt to the water, due to its electrical properties.
You can simply rinse the crystal in water, or you can continue by placing the crystal in a clear glass filled with water. Place the glass on your windowsill, ideally facing south, to recharge in the sun. We recommend against soaking quartz. Instead, trying some of the other methods that resonate with you, such as meditation, breathe, or even placing your quartz with cleansing stones like selenite, are the best way to deal with it.
The moon can also be used for cleaning. Some people will bury the crystal under the full moon night to use the magnetic force of the moon and the earth. You can also put the crystal under the direct light of the moon.