Bamboo Dry Brush with Vegan Sisal Bristles As the name suggests, a dry brush does not require water. Use a circular motion across your skin to lift dead skin cells and increase circulation. It can be used in the shower though (many customers love using this as a shower back scratcher!) Longevity: This brush will usually last 3 months, depending on how often it is used. To clean the bristles, boil the bristles for 1-2 minutes as needed. Environmental Impact: We carry one of the ONLY completely VEGAN dry brushes. With our plant based sisal bristles and bamboo handle, the entire brush is ethically made and compostable.