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Its a multistage process for me.
Scrape of the worst gunk.
Dump the parts in a ~10 gallon tub (a parts cleaner without a pump) with degreaser. Letting it soak for a couple of days. Brushing them once a day.
After this they should be reasonably "clean", whats left is the finish and wheel cleaner with some acid in it usually works quite good.
I found a German interior cleaner called SPAM, it is marvelous at dissolving carbon, submerge the worst possible piston you can think of and it will remove the carbon in a couple of hours.
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Magnus
911 Silver Targa -77, 3.2 -84 with custom ITBs and EFI.
911T Coupe -69, 3.6, G50, "RSR", track day.
924 -79 Rat Rod EFI/Turbo [email protected].
931 -79 under total restoration.
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