I would be kinda leery steam cleaning these later model engines. With all the sensors and electrical crap nowadays, I would think the high pressure from a steam cleaner wouldn't be advantageous or friendly to the systems.
I would go with gunk and a garden hose rinse.
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'89 LX 5.0 - 5 speed. Original Owner
'94 E-150 4.9 Hi-Top Conversion Van
'06 Mustang V-6, 5 speed
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