If you have a heated water steam cleaner with a good degreaser it will get the job done. If you don't have access to a steam cleaner then use mineral spirits and a rag to remove all grease the pressure wash with degreaser. Some of that degreaser will discolor th paint so be careful. I never use it straight.What is the best way to get heavy equipment clean? How is it cleaned for re-paint? Do you use chemicals or steamers? Or both?