1 have a 1999-jeep cherokee,the moter and the under body transmission is dirty there is mud and grease every where.can it be steam clean.
Yes, but high pressure steam should be kept off of certain things. (wire connectors, etc.)
What should be of concern is this “grease everywhere”. That sounds like an oil/dirt mix you’re referrring to so any leak(s) should be repaired.