HOME and GARDEN Newcastle - Benefits, Risks, and Limitations of Pressure Washing.
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Pressure washing is a powerful cleaning method used for surfaces like driveways, decks, siding, and vehicles. While effective, it comes with risks and limitations that should be considered. The time taken depends upon the area and surface condition (see table below). A connection to your electricity and water supply is required (see photos).

Benefits of Pressure Washing

• Deep Cleaning Power: Effectively removes dirt, black mould, mildew and green algae.
• Time and Labour Efficient: Can clean large areas quickly and easily, depending upon the state of the surface (see table below).
• Prevents Damage and Decay: Removes harmful mould and mildew, preserving surfaces.
• Eco-Friendly: Uses less water than traditional cleaning methods.
• Great for Surface Preparation: Ideal before painting or refinishing surfaces.
• Safer: Dirt, black mould, mildew, green algae and moss are all slip hazards. A clean surface is less slippery.

Risks of Pressure Washing

• Potential for Surface Damage: Without careful use, high pressure can strip paint, crack siding, or etch concrete.
• Personal Injury: Strong water streams can cause cuts, bruises, or eye damage.
• Equipment Costs: Purchasing and maintaining pressure washers is expensive.
• Block Paving: There is a risk of washing away the jointing sand. Soft washing is gentler alternative here, using a brush and cleaning solutions.

Limitations of Pressure Washing

• Not Suitable for All Surfaces: Delicate materials like soft wood and plaster may be damaged.
• Moss can be quite stubborn: Moss growing on concrete will take much longer to remove. Weed killer should be applied in advance, to kill the moss before removal.
• Requires Proper Technique: Incorrect usage can lead to unintended damage.
• Temporary Results: Dirt and grime return over time, requiring regular cleaning.
• Weather Dependent: Wind can spread dirt; cold temperatures may cause freezing.
• Soft Washing: Soft washing is gentler alternative, using a brush and cleaning solutions.

How long does pressure washing take?

It takes 15 minutes to set up the pressure washer and 15 minutes to tidy it away. The time taken depends upon the area and whether moss is present, according to this table, where 15m² is the area occupied by one car, 30m² by two cars and 45m² by three cars.

Approx Area/ m2	Clear of Moss	With Moss
15m2 (one car area)	1 hr	1.5 hrs
30m2 (two car areas)	1.5 hrs	2.5 hrs
45m2 (three car areas)	2 hrs	3.5 hrs

*Please note: The full impact of a cleaned driveway, patio or decking can only be seen when it is dry. It is not possible to see the improvement while the surface is still wet. It is not possible to remove 100% of all moss, black mould or algae, as these living plants, fungi or microbes can be stubborn.

Conclusion

Pressure washing is an effective way to clean and maintain outdoor surfaces, but it must be used carefully to avoid damage, injury, or environmental harm. Using the right settings and techniques can maximize its benefits while minimizing risks.

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