The Arctic climate is strongly influenced by clouds. The oxidative processing of pollutants in Arctic clouds affects droplet size and optical properties, important climatic effects. Arctic clouds contain naturally occurring organic lipids forming organic films on the droplet. Arctic cloud chemistry unusually involves chlorine and bromine radical chemistry. In this work we will study the kinetics of chlorine radicals with DPPC. Specifically we will (a) demonstrate that a common aqueous cloud oxidant, chlorine radical, can penetrate deep into the organic film and remove the film, quantifying its penetration distance (b) calculate the effect of the reaction on the hygroscopic properties of a cloud droplet and demonstrate removal of the organic film may cause a cloud to evaporate, (c) Support a STFC/NERC CASE award PhD students initial studies.