purdoux cpap cleaning soap for hose and mask (3 bottle 250ml/8.04 oz pack) (grapefruit-lemon scent) purdoux purdoux cpap mask & soaps are made without the use of harmful chemicals and are designed to clean silicone surfaces while preserving the softness of your cpap mask & hoses. our green tea and mint soap has a very mild scent to help neutralize odors of the silicone; while the grapefruit and lemon soap has a stronger scent leaving a pleasant aroma behind.