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How heavy of a grease build up are you trying to remove?
I've used Simple Green at full strength right out of the bottle and had good
luck with it in the past. Just be careful when using it on/around bare aluminum.
If you don't care about your paint, oven cleaner is your best bet. I'm currently cleaning up a 5L oil spill on my aggregate driveway and oven cleaner is literally the only product that actually works. I use it on pretty well anything if the paint isn't a concern.
If you want to keep your paint, gently scrape off any big chunks you can then use engine degreaser with a pressure washer.
Gasoline actually works and is cheaper than anything else I've tried.
Any other petroleum based solvent is great as well; Mineral spirits works well, but is about 4x the price of gasoline. It isn't as volatile, so it wets an area longer.
I've tried all the colored cleaners and they dont seem to do much more than plain water for me.
A siphon sprayer is a great way to apply whatever you decide, without wasting a bunch of it and doubles as an air gun to help clean it all off after.