While I understand some may feel differently, I’ve come to believe that all crystals really do need to be cleansed, perhaps some more frequently than others. I evne find myself cleansing my selenite when they seem to have gathered a lot of different energies, or after a particularly emotional week. Admittedly, I usually do this roughly once a month. I use incense for a gentle smoke cleanse, then set my intentions and affirmations into them afterward it seems to leave them refreshed and ready.