Concrete is porous — and oil penetrates deep into it fast. Within hours of a spill oil begins bonding with the concrete at a molecular level. That's why hosing it down or using a regular pressure washer without pre-treatment barely makes a difference. You need to break down the oil chemically before you can remove it with pressure.
We apply a professional-grade biodegradable degreaser to every oil stain before we touch the pressure washer. The degreaser penetrates the concrete, breaks the bond between the oil and the surface, and lifts it to where the pressure wash can remove it completely. This is the only method that actually works on oil — everything else just moves it around.
Results depend on the age and depth of the stain. Fresh oil stains often respond very well to this method. Older set-in stains typically see significant improvement. Joe will give you an honest assessment of what to expect before we start. Joe will give you an honest assessment of what to expect before we start.