Best grease removal from bbq grill? ...
dawn dish soap, hot hose and some Brillo pads
I burn most of it off by putting the grill into the hot ashes after BBQing food.
I saw a strong polythene backpack with cleaner stuff contained by it and you just hermetically sealed the grill in it. I saw this contained by Asda last summer
Lastly you could scour it sour with a lead bristle brush
Answers: TriSodiumPhosphate is the degreaser that is commonly used to verbs engine blocks. I'm sure it would work just fine on a BBQ grill. It is highly caustic so lug precautions.
Available at most hardware, paint and home centers.