How commercial jet washing works for business premises

Site survey

every commercial jet washing contract begins with a site survey to identify surface types, access, drainage and contamination levels

Hot water

hot water pressure washing is significantly more effective on grease, oil and biological matter than cold water and is standard for commercial food-service areas

Wastewater

professional contractors manage wastewater containment and disposal correctly to comply with London drainage regulations

Stage 1: Site survey and assessment

Every commercial jet washing contract begins with a site survey to establish the surface types present, the nature and extent of contamination, access requirements, drainage locations and any operational constraints such as working hours, traffic management or neighbouring premises. This survey determines the equipment specification, chemical pre-treatment required and the safe route for wastewater. It also establishes the scope of work, which forms the basis for an accurate quote and a realistic schedule.

Stage 2: Surface preparation and pre-treatment

Before the pressure washer is started, the area is prepared by removing large debris, positioning wastewater containment, protecting drains where required and applying pre-treatment chemicals to heavily contaminated areas. On commercial forecourts, car parks and service yards with oil and grease contamination, a Traffic Film Remover or industrial degreaser is applied at the required concentration and left to dwell for an appropriate period before washing begins. This pre-treatment stage is what allows the subsequent pressure washing to produce a thorough result rather than simply spreading surface contamination.

Stage 3: Pressure washing with the correct equipment and settings

Commercial jet washing uses diesel or industrial electric machines operating at significantly higher flow rates than domestic equipment, typically 15 to 25 litres per minute or above. Hot water capability is engaged where contamination is grease-based or biological. Surface cleaner attachments are used on large flat areas such as car parks and forecourts to cover area efficiently and produce a consistent finish without stripe marking. The operator works systematically across the area, ensuring all sections receive adequate coverage and that dirty water is directed away from already-cleaned surfaces throughout.

Stage 4: Focused treatment of stains and problem areas

After the main pass, areas of persistent staining, oil contamination or biological growth that have not fully cleared receive focused attention with targeted chemical treatment or a second high-pressure pass. Gum removal on entrance areas, rust staining from metalwork, bird guano deposits and specific chemical contamination areas all require different secondary approaches and the correct product selection.

Stage 5: Final rinse and wastewater management

A thorough final rinse clears all cleaning chemical residue from the surface and collects the contaminated wastewater. Professional commercial contractors do not allow wastewater containing oil, detergent or suspended solids to enter surface water drains. Wastewater is contained, pumped to the foul sewer or collected by licensed waste carrier, depending on the volume and contamination type.

Stage 6: Post-treatment and reporting

On scheduled maintenance contracts, a post-treatment biocidal application helps slow the return of algae and biological growth between cleaning visits. The contractor reports on any surface damage, drainage issues or maintenance concerns identified during the clean, allowing the property manager to prioritise follow-on work before it becomes a larger problem.