These hood hinge parts are clean and ready for phosphating. Grease and oil interfere with the phosphating process. Palmetto's directions recommend removing grease and oils with an alkaline cleaner, which includes Easy-Off Oven Cleaner. However, they say this step is not required unless there is a heavy build-up of grease and oil on the part. They also mention glass beading or bead blasting on parts with a heavy grease build-up. Etching the metal allows the phosphate to chemically bond. Don't touch the parts with bare hands or use cleaners after sandblasting as this will leave a residue and create a spotty or streaky finish.