You have to remove the manifold and get the carbon/soot out manually
Loose Carbon stuck between a valve and seat is nasty $$$$$$ on a Diesel engine if you expect the engine to digest that gunk
After cleaning disconnect the egr valve or run the engine breather into a catch can, either will stop the reinfestation of that black power robbing goop
Mobil delo esp engine oil is designed especially to stop oil vapour and exhaust gas accumulations.
Aussie 4wd forums are full of info on egr/manifold cleaning/modifying instructions
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