Grease and Oil Stain Removal from Commercial Surfaces

Grease and oil stains around dumpsters, drive-throughs, loading docks, and restaurant exits are stubborn, slippery, and a real liability. Plain pressure washing rarely fixes them. Here's how grease is actually removed from commercial concrete and asphalt in Ontario.

Why Grease Is Harder Than Ordinary Dirt

Grease and motor oil aren't sitting on top of the surface — they soak into the pores of concrete and the binder of asphalt. That's why blasting a grease stain with water alone just spreads it and leaves a shadow. Effective removal has to chemically break down the oils and lift them out of the pores, then flush them away, rather than simply pushing water across the top.

The Right Process: Degrease, Agitate, Extract

Professional grease removal follows a sequence: apply a commercial-grade degreaser suited to the surface, give it dwell time to penetrate and emulsify the oil, agitate to work it into the pores, then pressure rinse (often with hot water, which dramatically improves grease removal) to extract the broken-down residue. Heavily saturated areas may need more than one pass. Hot-water washing is the difference-maker on grease that cold water can't touch.

Surface Matters: Concrete vs. Asphalt

• Concrete tolerates higher pressure and hot water well and usually cleans up to near-original appearance with the right degreaser.
• Asphalt is petroleum-based, so harsh solvents and excessive heat can soften the binder — it requires a gentler, asphalt-safe degreaser and controlled technique. The wrong product can damage the very surface you're cleaning.

Knowing which approach a surface needs is exactly what separates a professional result from a worse-looking stain.

Grease Removal Is Also Slip-and-Fall Risk Management

Grease-slicked walkways and entrances at restaurant exits and loading areas are a documented slip-and-fall hazard. A grease stain that's also a known wet hazard is the kind of thing that turns into a liability claim. Scheduled degreasing of high-grease zones is cheap insurance against a far more expensive incident, and it keeps the property compliant with the duty to maintain safe premises.

Environmental Handling of Wash Water

Grease-laden wash water cannot simply be flushed into a storm drain — that's both an environmental problem and a municipal compliance issue. Professional crews contain and dispose of the wash water appropriately. This is one of the clearest reasons to use a commercial operator rather than a quick DIY rinse that sends oil straight into the watershed.

Keep High-Grease Zones Clean and Safe

D&D Commercial Services handles grease and oil stain removal as part of our commercial pressure washing service, using hot water and surface-appropriate degreasers for restaurants, plazas, and industrial sites across Waterloo Region. Pair it with parking lot maintenance for a complete exterior program.

Devon Moore, Operations Lead Co-Founder & Operations Lead — D&D Commercial Services

Devon Moore is the co-founder and Operations Lead at D&D Commercial Services, delivering professional commercial property maintenance across Waterloo Region.