HD12 Heavy Duty Degreaser - 20 Litre Bio-Degradable, Quick Break, Water Based Degreaser Premier One HD12 is an aggressive non- solvent, concentrated degreaser for use in heavy- duty industry applications. HD12 is a water based formulation with a range of high quality active ingredients designed to penetrate and remove high concentration grease, oils and dirt encountered in earthmoving, mining and heavy workshop tasks. HD12 is designed to be applied by hand spray, or used in steam cleaners and high pressure washers, delivering effective heavy duty cleaning.