Has anyone used a solution they were pleased with to soak cylinder heads to clean them up? I have a large container that the 2 heads will fit in submerged in whatever solution I choose. I am aware carbon may need more effort than just soaking but if it were softened that would help. the only areas that need attention are the combustion chambers and exhaust ports. Maybe it would be easier just to clean those areas?

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Tony H
W111 280SE 3.5 Coupe
Manual transmission

Past cars:
Porsche 914 2.0
'64 Jaguar XKE Roadster
'57 Oval Window VW
'71 Toyota Hilux Pickup Truck-Dad bought new
'73 Toyota Celica GT