Surfactants are used in everyday cleaning products. In the absence of oil (grease) and above a critical concentration the surfactant forms a micelle. Often fragrances are added to the cleaning product to provide a more pleasing odour. Fragrances are simply small molecules which will partition between the water and the surfactant micelle. The aim of the current proposal is to find out how fast a small molecule transfers from the water to the micelle and vice versa.