Tips on Chinchilla Baths
Although they are fastidious groomers, chinchillas don't bathe in water. Instead, they bathe in dust, rolling in it until they feel sufficiently clean. Provide them with dust for a bath every day, for 15 minutes to an hour at a time. Place 1 inch of the dust in a flat dish large enough for the chinchilla to roll in. Don't leave the dust bath in the cage because the animal will begin to use it as a litter box.
For more information, please read the article Chinchilla Care.