Identify suitable surfaces
Concrete, pavers, brick, timber, render, painted finishes and grout respond differently to water pressure. Test only where appropriate and avoid pressure on fragile, loose, cracked or deteriorated surfaces. Roofs and high-level work require separate qualified access assessment.
Choose equipment and settings carefully
Follow the washer manual for pressure, nozzle, distance and detergents. Do not rely on nozzle colour alone; manufacturers may use different systems. Keep the spray away from people, electrical equipment, seals, vents and fragile areas.
Plan drainage and runoff
Identify water supply, drains, slope, runoff direction, gardens, neighbouring property and public paths. Do not send dirty water or chemicals where they could cause damage or enter an unsuitable drain. Weather and access can change the safe method.
Know when to hire a professional
Large areas, coatings, height, chemical treatment, shared property and uncertain materials need separate assessment. Sealing, repairs, mould remediation and hazardous-waste handling are not ordinary pressure-cleaning tasks.
