Acharya Prashant explains that while physical cleaning involves material objects on the same plane, the relationship between a Guru and a disciple involves a transcendence of planes. He defines the dirt of the mind as the illusion of the ego—the false identification with the body, social roles, and personal history. This sense of 'I' is entirely material because it begins and ends with the physical body. Unlike a physical cloth where dirt and fabric are separate, the mind is essentially composed of this dirt. Therefore, when the illusion is removed, the mind itself disappears, leaving no trace of the former identity. He further clarifies that since the impurity is an illusion, the water required for cleansing is not a physical substance but spiritual understanding or Bodha. He notes that when a disease is unreal, the diagnosis itself is the cure. A disciple often mistakenly views the Guru as a washerman who will only remove vices while preserving their virtues or identity. However, the Guru aims to dissolve the entire structure of the ego, including the traits the disciple considers beautiful or essential. The Guru focuses on what the disciple hides, as these deep-seated patterns and attachments are the most dangerous forms of conditioning. Ultimately, the process of spiritual cleansing leads to the realization of one's true nature as Infinite Light. This light is steady, unchanging, and independent of the external world's fluctuations. Once the dirt of duality is removed, the perceived distinctions between the disciple, the Guru, and the Creator vanish, revealing a singular, non-dual reality. The speaker emphasizes that anything that changes is dirt, while the true self is the unchanging witness, much like light that remains constant regardless of the activities occurring within it.