SONAX Car Shampoo Concentrate is a brilliant, surfactant-rich formula. Our 25L option is available for special order. Thick lathering action and pleasant scent. SONAX Car Wash Shampoo Concentrate is a highly effective, phosphatefree and pH-neutral formula that penetrates and loosens tough dirt without damaging or stripping the protective layer. The special anionic surfactants within, simultaneously adhere and distribute dirt leaves a brilliant, clean shine to your paint, rubber, plastic, vinyl and glass surfaces every time! Directions 50ml (2oz) in 10L (3 gallons) of warm water.