Interior Sponge Duo. For deep cleaning of different surfaces. White side with fine nylon fibres for massaging in cleaners onto leather, plastics or textiles. Grey microfibre side absorbs the dissolved dirt. Inside there is a sponge core that can store liquid. White side with fine nylon fibres for massaging in cleaners. Grey microfibre side absorbs the dissolved dirt. Inside there is a sponge core that can store liquid. *By request/order.