The useful question is what needs cleaning and what must remain intact. Concrete, coated cladding, glazing and signs should not be grouped into one undifferentiated pressure-washing request.
Identify the surface and its condition
List the material, any paint or sealer and the type of dirt or staining. Point out loose coatings, open joints and previous repairs so the proposed cleaning area is clear.
Check equipment and cleaner compatibility
Kärcher’s surface-cleaner guidance calls for compatibility checks and a small test before treating the entire area. Its professional detergent range also distinguishes applications. These are reasons to discuss the surface, equipment and cleaner together, not choose by maximum pressure alone.
Agree on a test area
Identify a small, representative location and what a satisfactory result would look like. Ask how the proposed method will be adjusted if it changes the finish or does not remove the stain; do not assume every mark is removable.
Plan the site while cleaning takes place
Mark entrances, public routes, neighbouring surfaces and sensitive equipment. Include operating hours, water access and nearby drains. Ask how wash water and temporary access restrictions will be managed for the actual site.
Send a washing scope
Photographs showing both the overall elevation and close-up soil are more useful than a request for the strongest machine. Specify the surfaces included and those that must be left alone.
Include these details
- Surface and existing coating
- Soil or stain photographs
- Access, water and drainage locations
- Send the site details and your question
Questions about this topic
Is more pressure always a better cleaning method?
No. The proposed method needs to suit the surface and its condition. Ask for a test area and the equipment or cleaner compatibility information.
Should windows and painted panels be included automatically?
List them explicitly. Separate materials and coatings may need different methods and should be described in the scope.