I have previously wrote about the Essene ritual bathing and how you can use your shower or bath to help remove negative thoughts and energies that drain your spirit and prevent spiritual growth.  There are other ways to use visualization to help rid yourself of negativity.  Here are a few:

• Visualize your mind as a dirty floor and sweep the negative dirt away
• See yourself as a cluttered closet and clean the negativity out and throw it away
• See your mind and spirit as a garden full of beautiful, positive flowers, but also negative weeds and see the weeds wither and die, or, better yet, see the weeds being transformed into positive flowers also.

You can probably think of other scenes, but that should get you started.    You can see the negativity being removed by angels, God, or your higher self.  When you visualize, it's important to be in a relaxed state of mind and to visualize the scene with as much detail as possible.  Don't just see it, hear the sound, smell the odors, make it real.