A lot of steel is coated with grease or oil to avoid rusting. Just by nature of working with it you also need solvents to remove it. The degreasers of the past

A lot of steel is coated with grease or oil to avoid rusting. Just by nature of working with it you also need solvents to remove it. The degreasers of the past were magically powerful and environmentally catastrophic. Never mind all the oil/grease used.