Rite of Cleansing
This rite purifies a person, place or object, allowing it to be used without fear of contamination by the Wyrm. To perform this rite the Garou must inscribe a circle on the earth, walking widdershins (counterclockwise) around the afflicted person(s) or object(s) while holding a smoldering branch or torch. She must use a branch (preferably willow or birch) dipped in pure water or snow to asperge the object or person cleansed. As this is done, all Garou present release an eerie, otherworldly howl in an attempt to "frighten away" and thus banish the corrupting influence. Ideally, this rite is performed at dawn, but it can be performed at any time.
This rite can be cast upon more than one person or object, but the leader must spend one Gnosis point on each extra thing or person in need of cleansing. The difficulty level equals the Gnosis of the spirit that inflicted the contagion (maximum of 10). Only one success is required. If the rite is performed at dawn, the difficulty level of the rite is reduced by one. Note that this rite cannot heal wounds or damage caused by contamination (see the Fianna Gift: Resist Toxin, pg. 127); it only removes any existing contamination.
Source: Werewolf the Apocalypse