Spiritual House Cleaning is about achieving a positive flow of energy.
Nature is perfect, but man influences it. In reality, all structures are vibrations - so all structures resonate with each other - ourselfs with our environment, the environment with us - everything is in resonance with everything. E.g. a piece of iron lies on a table and is guided "invisibly" by a magnet underneath the table.
A resonance always arises when two bodies vibrate at the same frequency. They are in harmony, so to speak, or in unison. As an example, I can cite that when we see someone biting into a lemon, our mouths water immediately.
We know how it tastes and how it affects us. So we're going into response.