Bath, shower, sprinkling, swimming, immersion in water, and so forth, are all symbolic equivalents for solutio that appear commonly in dreams. All of these images relate to the symbolism of baptism, which signifies a cleansing, rejuvenating immersion in an energy and viewpoint transcending the ego
Edinger establishes bathing in all its forms as the primary dream-symbol of solutio, linking personal psychological dissolution to the archetypal pattern of baptismal death and rebirth.
, Anatomy of the Psyche: Alchemical Symbolism in Psychotherapy, 1985thesis