I am a chemist by training and profession. I would neutralize the acid with a base, Baking soda, washing soda, etc. Rinse with cold water, followed by an immediate dry with towels and warm air. Use a heat gun rather than a torch since the water in the combustion products from a torch will condense on the steel. There is also a possibility of altering any heat treatment if a torch is used. Then application of a light protective coating of oil should keep the steel rust free until assembly.
Non polar solvents like lacquer thinner won't be effective at removing oil. However, WD40 is a known water displacement product. I would still wipe dry and dry with warm air prior but it will help to eliminate water in tight corners.