There are several ways to cleanse your crystals. If they are non soluble, they can be passed under running water for 30 seconds. If they are fibrous and dissolve easily in water, they can be placed in salt overnight.
You can smudge crystals, pass them through the light of a candle or visualize them being surrounded by purifying light. Moonlight or sunlight can also be used for cleansing crystals by placing them in direct light for a few hours.