Energy is everywhere and absorbs into everything, like a stone dropping into a still pond, energy ripples out into everything.  It becomes recorded into the walls, floors, ceiling, furniture, as well as every object in the space.  It gets imprinted into the very essence of the structure.  Repetitive actions and behaviors deepen the imprint.

Energy clearing is a profound and highly effective technique to clear past energies from any space that has been occupied and make a fresh start. It is a process in which negative thoughts, emotions and repetitive stress from current or previous situations are located and removed.

Negative energy can be generated from a previous owner, a construction crew. Maybe the energy of someone passed on remains behind. Turmoil in your own life such as a divorce, a grievous argument, or a death. Whatever the reason, clearing these and other 'stuck' energies can relieve you from the distress of past trauma and the pain of other people’s lives. Objects in a room can bring in unwanted energy associated with their previous owners.

Clearing is the ancient practice of burning dried herbs or Palo Santo sticks and allowing the smoke to cleanse the air. In addition to the ritualistic purpose of this, there is a scientific side as well.
There have been several studies, but one study in particular represents a comprehensive analysis and scientific validation of our ancient knowledge about the effect of ethnopharmacological aspects of natural products smoke for therapy and health care on airborne bacterial composition.
The results showed that energy clearing caused over 94% reduction of bacterial counts by 60 minutes. The ability of the smoke to purify or disinfect the air and to make the environment cleaner was maintained up to 24 hours in a closed room.