Cetaphil Gentle Skin Cleanser. Available from many supermarkets or online drug stores.
For maximum glans suppleness, NEVER use soap – or anything except clear water – on the end of the penis. The more you prod the surface under the water stream, the more loose surface cells you will dislodge and the less will remain to be digested by beneficial bacteria. If you’d rather smell unnaturally sterile then do scrub gently, and if you want to undo an accumulation of natural scent use nothing stronger than this Cetaphil non-soap cleanser. DO use plain soap for the daily washing of silicone DEVICES.
We have found that the cheaper generic versions of this product perform as well as the name-brand product.