An agrochemical formulation comprising a penetrant and an agrochemical active. The penetrant is an esterified and/or etherified polyol alkoxylate obtainable by directly esterifying and/or etherifying a polyol alkoxylate. There is also provided a method of making the penetrant comprising alkoxylation of a polyol, and esterification or etherification of the formed poyol alkoxylate. The penetrant is suitable for use in agrochemical formulations to enhance penetration of the active across a leaf cuticle.