Hot, hot, a very hot pail of 212 plus degrees F dish detergent soapy water. As the metal heats-up most of that 60 year old gunk surfaces so you can scrub it out. Asbestos type thick gloves? Darn right. You can't do this job without them.
At 212 degress the water will evaporate; but, there'e always a butt,
this will also remove all/any kind of lubricate/preservatives of all kinds so you will have to immediately grease or oil your action, and then put a thin coat of oil on all metal surfaces.
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