Have noticed some of the "bikes of the months" on jamies page have immaculately clean engines. I am rebuilding my bike from the ground up and would like to get my engine this clean but not sure what to use.

Have used degreaser which has got all the grease off but there is still the oxidation etc. How can I get this cleaned? Have heard oven cleaner is this a possibility, is this true?

Any reccommendations would be awsome thanks?
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94 mc28 SE