Crystals collect and build up energies from you and the environment around you so they should be cleansed and recharged regularly to rid the negative energies that you are trying to remove and to replenish the crystals' healing energies

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There are a number of ways you can cleanse your crystals which are shown below and you should use the method which feels right to you. Some crystals can't be cleansed using any method though so please do your research! 

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Whilst cleansing your crystals, set your intention by saying what you want them to do.  The more you do this process, the stronger the stones' energies will be and the more you will be able to connect with them.