Grease is a hot water job. Full stop.
Cold water does not remove grease. It moves it around, spreads the stain thinner, and lets it set right back where it was. Dumpster pads, drive-thru lanes, and loading areas get hot water degreasing: heat breaks the grease down, the degreaser lifts it, and the surface actually comes clean.
Open lot areas get surface-cleaned in even passes so the finish is uniform, with drive lanes and parking stalls sequenced so your property never fully closes. Early morning work before tenants open is standard.

Degreasing, before and after
Before
AfterStraight answers
The questions I actually get, answered the way I answer them on the phone.
Can you clean without closing the lot?
Yes. Work gets sequenced by section, early hours where it helps, so tenants and customers keep access the whole time.
How often should a dumpster pad be degreased?
High-traffic pads at restaurants and grocery anchors typically want quarterly attention; lighter pads can go longer. A site walk gives you a real number for your property.