Assuming you are referring to the Revlon One-Step Hair Dryer & Volumizer Hot Air Brush, cleansing it is pretty simple. The bristles are nylon and can be detached from the brush head for easy cleaning. Just remove them and rinse with warm water and shampoo. You can also use a small amount of alcohol on a cotton swab to disinfect the bristles if needed. The barrel of the brush should not be submerged in water, but you can wipe it down with a damp cloth if necessary.