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This is what we use on the really greasy nasty units usually in close proximity of restaurant ex. fans,restaurant equipment, oily blown up shiet. It's Really Nasty super concentrated Sodium Hydroxide and not to be played around with. We have to be cautious about what,where,on we use it.
Probably the most strongest cleaner legally available. Wear PPE when using it.
Basically Extra heavy-duty sprayable Easy Off times ten in strength.
It WILL STRIP PAINT !!! Ruin Metal Roofing,generally f'up most things subject to cleaners on a larger scale.
Zoom products Mighty Boss is another Excellent product I've used for a long time. Really user friendly but no whimpy cleaner either. My choice generally.
And yeah, like Jim said,pre power wash what you can first.
I said Zep but looked at it again and it's Zoom. Really good all purpose cleaner and about as good as the Purple but not near as caustic. I've used about Everything and Boss is the Boss for 90% of things.