The FSM wants you to use this product:
Oil Cleaner in cooling system: disodiumtrixosilicate-pentahydrate.
Part number is A 001 986 21 71 (500 g)


Believe it or not ,I've successfully used the Laundry product "Shout" added to
tap water to clean oily residues from cooling systems.
[You have to flush with clean tap water MULTIPLE times,though]

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