Raw Crystal: How to Clean & Identify Them, and Unravel Their Enigmatic Beauty There is a possibility that your Raw Crystal requires a more extensive cleaning once the above process is complete. If this is the case, then we suggest that you scrub the raw crystal with a soft nonabrasive brush, and while doing so, be mindful of not pressing too hard against the stone. Pressing too hard can cause scratches on the stone’s surface. Once done, the raw crystal should be allowed to dry off naturally.