FD-CLEAN is a special liquid cleaning agent used for removing oil, grease and fat residues (e.g. lubrificants, grease, animal and vegetable fat and oils, cheese-making product residues, etc.) from concrete floors so that epoxy layers may be applied on them without adhesion problems. FD-CLEAN penetrates the pores of the concrete floor soaked in oil or fat residues and emulsifies them so that they can be removed with water. FD-CLEAN is used for removing lubricants and mineral oils from concrete floors in garages, repair shops, machinery spaces, etc., as well as for removing oil and fat residues from concrete floors in food industries, warehouses, etc. First, the floor surface is cleaned from dirt by high-pressure hot water-jetting. Then, the floor surface must be properly prepared e.g. by milling, shot blasting, etc. so that the pores of the substrate are opened. FD-CLEAN is then poured on the floor and rubbed meticulously with a hard wire-brush in order to penetrate the substrate pores and emulsify the oil or fat that has soaked into the floor. After at least 30 minutes, the emulsified oil or grease is removed from the pores of the floor by means of high-pressure hot water-jetting.