Contamination of any kind (oil, grease, diesel residue, biological, atmospheric, etc.) left sitting on any industrial equipment metal surface will start the corrosion process. It is also unsightly. This is not what the owner wants. McCahill Painting Company uses 250° hot water, an incredible cleaning tool by itself. We then use an electric sprayer to apply a biodegradable, environmentally safe industrial degreaser. The combination of these two tools completely removes all contamination. Industrial equipment cleaning will not only protect the metal, it will make it look pretty/professional.