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What you need to do to remove soaked in oil and grease is use a mix of acetone and calcium carbonate (not to be confused with calcium bi-carbonate.

It's like chalk dust and mix a little in a tin...

Boiled linseed oil is not the way to go as most of the stuff you get now has a hardener and other stuff added. If you have months available and lots of patience numerous small coats of raw linseed...