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Fill your sink or a bucket with one part vinegar and three parts lukewarm water. Mix the solution thoroughly. Pad the bottom of your sink or bucket with a soft towel to prevent the crystal from getting damaged.  Vinegar will help remove cloudiness from crystal as well as add a beautiful shine.  You can also substitute ammonia for vinegar. Allow the crystal to soak for five to ten minutes. If your item is too big to fully submerge, you can fill it with the solution (e.g., a vase or bowl) or dampen a soft cloth or sponge in the solution and use it to wipe down the crystal (e.g., a lamp or figurine). Be sure to use a soft cloth or sponge so as not to scratch the crystal items. Gently rub your cloth or sponge on the surface of the crystal using a circular motion. Air drying will often leave water spots, so use a lint-free or microfiber cloth. You may want to wear gloves so you don’t get fingerprints on your clean crystal. Carefully pat the crystal dry, rather than rubbing it.

Summary:
Create a solution of water and vinegar. Submerge your crystal in the solution. Wash your crystal carefully with a cloth. Dry your crystal.