Looks grim-ier than regular dirt.
Might need basic degreaser with some agitation.
If you really wanna go OCD, I'd use some "spray and rinse with high pressure" waxes like Turtle Wax Seal and shine/Meguiars Hybrid Ceramic/Mothers CMX for easier cleanup "next time". Stupid easy to apply, no need to physically touch/remove, and lasts months.