DOFF Steam Cleaning vs Pressure Washing: Tough Stain Removal?
When it comes to cleaning the exterior of a building, not all methods are equal. From car parks caked with oil stains to centuries-old stone façades covered in carbon deposits, the right technique makes the difference between restoring a surface — or damaging it.
The two most common approaches people talk about are DOFF steam cleaning and pressure washing. Both have their place, but they serve very different purposes.
What is DOFF Steam Cleaning?
DOFF is a specialist cleaning system that uses superheated steam (up to 150°C) at low pressure. It gently penetrates pores in the surface without blasting it apart. Because it works with vapour, not force, it is widely approved for use on heritage and listed buildings.
It excels at removing algae, moss, graffiti, paint, chewing gum, biological growth, and carbon staining. Importantly, it also kills spores and bacteria, reducing regrowth and keeping façades looking cleaner for longer.
What is Pressure Washing?
Pressure washing is the traditional cleaning method most people know — high-pressure water (often 2,000–3,000 psi or more) aimed directly at the surface. It’s quick, aggressive, and effective at shifting heavy deposits like cement splashes, mud, chewing gum, and oil on hard-wearing areas such as car parks, loading bays, and pavements.
But pressure washing isn’t suitable for delicate or porous materials. Used in the wrong place, it can strip render, pit stone, or drive water deep into walls where it causes longer-term damage.
DOFF vs Pressure Washing: A Side-by-Side Comparison
| Feature / Purpose | DOFF Steam Cleaning | Pressure Washing |
|---|---|---|
| Water Pressure | Low pressure | Very high pressure |
| Temperature | Up to 150°C (steam) | Cold or hot water |
| Best For | Algae, moss, lichen, graffiti, paint removal, carbon staining, biological growth | Mud, oil, tyre marks, cement splashes, chewing gum on pavements |
| Surface Suitability | Heritage stone, render, brickwork, delicate façades | Concrete, tarmac, industrial yards, robust paving |
| Damage Risk | Minimal — gentle on sensitive surfaces | High if used on stone, render, or brick |
| Extra Benefit | Kills spores, reduces regrowth | Quick coverage of large areas |
| Common Use Cases | Listed buildings, historic stonework, commercial façades, monuments | Car parks, driveways, warehouse floors, industrial sites |
So, Which is Better for Tough Stain Removal?
For organic or atmospheric staining (moss, algae, carbon deposits, graffiti, paint): DOFF steam cleaning is the clear winner. It removes the stain without harming the surface and prevents it from coming back as quickly.
For industrial or surface-level stains (oil, tyre marks, cement spills, chewing gum on tarmac): Pressure washing has the edge. Its force shifts what steam cannot.
In many cases, the most effective approach is a combination of both methods — DOFF for walls, façades, and heritage stone, and pressure washing for car parks, yards, and robust ground surfaces.
✅ At CCWC Services, we specialise in both methods, tailoring our approach to each site. Whether it’s a Grade II listed building or a busy retail park, we use the right system to protect your property and achieve the best results.
