Nanu said:.............. a pig to keep clean
Aye, you're absolutely right.
But Bilt-Hamber make a citrus based de-greaser that cuts through everything I've ever thrown at it and being a non acid based product it's kind to paint finishes. Spray applied and given a few minutes to work, grease, oil, brake dust, tar, dead bugs etc just fall off. You can even hose down your barbecue with it.
And if all of that fails, there's always child labour and a pressure washer although you can't mix the two..................