What builds up at a loading dock
Docks take constant truck traffic. Idling trucks drip oil and coolant in the same spots every day. Forklifts track tire marks and grime in and out. Broken pallets leave splinters, nails and shrink wrap. Spilled product, from food to chemicals, ends up on the concrete and in the corners where wind pushes it.
The dock apron, the area where trucks back in, is usually the dirtiest surface on the property. It often sits in a slope that sends water and debris toward a drain at the bottom, which is exactly where wash water control matters most.
Dirt at the dock does not stay there. Forklifts and foot traffic carry it into the warehouse, and drivers walk it into offices. Grease on a dock apron can also make the surface slippery when it gets wet during the rainy season, roughly November to March. A regular cleaning keeps the apron predictable underfoot and keeps less grime moving indoors. It also makes new leaks easier to spot, since a fresh drip on clean concrete stands out right away, and a truck that is losing fluid can be flagged early.
Step one: clear the debris
Before any water goes down, the area is swept and cleared. Pallet fragments, nails, shrink wrap and loose litter are picked up. This protects the cleaning equipment, keeps debris from clogging the drain cover used for containment, and gives the cleaning solution direct contact with the concrete.
Ask your team to move pallets, empty carts and staged goods out of the work area before the crew arrives. Anything left in place gets cleaned around, which leaves dirty outlines on the concrete.
Degreasing and washing the concrete
Oil and fluid stains get a commercial degreaser applied and left to dwell. Then the apron is washed with hot water through a rotary surface cleaner, which handles large flat areas evenly. Hot water matters here because truck oil and grease soften with heat and release far more easily.
Dock plates and levelers are steel and should be cleaned with care. Water and debris shouldn't be forced into the leveler pit mechanism. Dock bumpers and the wall around the door collect black tire marks, which come off with a degreaser and moderate pressure. Old, deep oil stains in concrete generally lighten rather than disappear, so it is worth expecting improvement, not perfection.
Containing the wash water
Many dock aprons drain to a trench or inlet at the low point. That drain is often connected to the storm drain system. Under Los Angeles Municipal Code section 64.70.02, untreated wash water from paved-surface washing and mobile operations cannot be discharged into the storm drain system unless a permit allows it.
The usual method is to cover or block the drain, let the slope bring water to that point, and vacuum it up for proper handling. If your facility has its own clarifier or permitted drainage, share those details with the cleaning company so they can plan around it.
Warehouse walls, doors and scheduling
Tilt-up concrete walls, roll-up doors and signage collect dust, exhaust film and cobwebs. They are soft washed at low pressure, with gentler handling for painted surfaces. After Santa Ana winds, a dust layer on the whole building is common, and a rinse restores it quickly.
Docks are best cleaned when shipping is slow: early mornings, evenings or weekends. Large docks can be done one bay at a time so receiving never fully stops. Our office hours are Monday to Saturday, 7am to 6pm, and same-day service is available when the schedule allows.
Pairing it with fleet washing
If your trucks or vans park at the same facility, it often makes sense to wash the fleet on the same visit. As of October 2026, our calculator lists fleet washing at $45 per vehicle with a five-vehicle minimum, parking lot and concrete cleaning at $0.25 per square foot, building exteriors at $0.30 per square foot, and dumpster pads at $85 each. Every visit has a $195 minimum.
Booking two services together saves 5%, and three or more saves 10%, so a dock, building and fleet combination adds up. At Say Wash It we confirm a flat price before starting and walk through the finished site with you. The instant quote on this page gives a fast first number.
Key points
Degreasing and washing the concrete
Oil and fluid stains get a commercial degreaser applied and left to dwell. Then the apron is washed with hot water through a rotary surface cleaner, which handles large flat areas evenly. Hot water matters here because truck oil and grease soften with heat and release far more easily.
Containing the wash water
Many dock aprons drain to a trench or inlet at the low point. That drain is often connected to the storm drain system. Under Los Angeles Municipal Code section 64.70.02, untreated wash water from paved-surface washing and mobile operations cannot be discharged into the storm drain system unless a permit allows it.