Before You Start: Inspect First, Then Clean
Treat the facade as a panel-and-fixing system, not as a washable stone surface. Photograph panel alignment, cracks, chips, open or sealed joints, drainage paths, window perimeters and any fallen fragments before water or cleaner changes the evidence. Dust and rain streaks can usually move through a controlled sequence of dry removal, clean water, neutral low-residue detergent, soft agitation and complete rinsing. A panel that has shifted, rattles, sounds unstable in wind, has a through-crack, or has a failed visible fixing is no longer a cleaning task.
For a routine work order, separate three decisions: what can be cleaned from a safe access system, what needs a closer facade inspection, and what requires an exclusion zone plus a qualified facade or structural engineer. The panel manufacturer’s care sheet and the building’s facade O&M manual remain the product- and system-specific controls.
Build the Inspection Route Before You Clean
A useful maintenance record lets another person find the same condition six months later. Divide every elevation into a simple location system: elevation letter, floor or datum, grid line and panel number. Photograph from fixed ground viewpoints first, then record close-access observations against those codes. Include the weather, whether the surface was wet or dry, and whether the mark changes after drying.
The Dekton facade care manual uses six-month or annual inspection as a location-dependent starting point and calls for annual checks of ventilation, drainage, drips, seals, closures and anchoring/joints. UK government cladding-condition guidance similarly recommends six-month general visual reviews and a camera record at intervals no longer than twelve months. These are useful planning examples, not a universal statutory interval for every sintered-stone facade.
Illustrative plan: an eight-storey urban office
Assume pale matte panels on a mechanically fixed ventilated rainscreen beside traffic-facing streets. Start with a ground-level visual review every six months, an access-based inspection every year, and an event inspection after facade impact, severe wind, nearby construction dust, access-equipment contact or a water-entry report. Use four fixed elevation photographs plus close-ups tied to the panel grid. If two annual cycles show stable conditions, the owner and competent facade professional may revise the plan; the article does not pre-approve a longer interval.
| Status | Typical observation | Action before cleaning | Close-out evidence |
|---|---|---|---|
| Green — appearance | Dry dust, pollen, light traffic film or rain streaking; panel and joints remain aligned | Proceed to a controlled cleaning pass | Dry before/after photographs and cleaner batch or product record |
| Amber — investigate | Recurring stain at one joint, hardened or split sealant, blocked open joint, edge chip, localized oxidation or moisture trail | Hold the affected area from routine washing; arrange close access and trace the source | Defect map, dimensions, photographs and planned repair owner/date |
| Red — make safe | Out-of-plane panel, rattle, missing or displaced clip, through-crack, fallen fragment, active water entry or movement after an impact/storm | Stop work, establish a ground exclusion zone and contact a qualified facade/structural engineer | Engineered access, temporary restraint and repair/replacement plan |
Clean Dust, Rain Streaks and Pollution in Escalating Passes
Begin with the least aggressive method that can remove the identified deposit. Work from the top of a defined bay downward so runoff does not re-soil completed panels. Keep dirty wash water away from lower windows, entrances, landscaping, drainage inlets and materials that the cleaner has not been approved to contact.
- Record the dry condition. A wet panel can hide haze, mineral residue and a small crack. Photograph the test area dry and mark its location in the elevation record.
- Remove loose dust. Use clean water or a soft brush/vacuum method suited to the access equipment. Avoid grinding airborne grit across polished or decorated finishes.
- Run a water-only pass. A low-pressure hose and soft cloth or nylon brush will show whether the mark is loose atmospheric dirt or a bonded residue. Rinse and allow the patch to dry before escalating.
- Use a neutral, low-foam, wax-free detergent. Dilute it exactly to its label, wet one test panel or a clearly bounded 0.5–1 m² area, allow only the stated dwell time, agitate with a soft tool and prevent the solution from drying on the face.
- Rinse completely. Residual surfactant can dry as a new streak or attract the next layer of dust. Use clean water until runoff is free of foam, then review the panel again when fully dry and, for a new method, after 24 hours.
Dust and construction film
Dry-remove loose particles first, then use water and a neutral cleaner. If cement, grout or sealant residue is suspected, stop the general wash and identify the chemistry; an acid or solvent that works on a panel face can attack metal, sealant, coating or adjacent glass.
Rain streaks and mineral traces
Trace the line upward before cleaning. A recurring streak below a coping, drip, joint or corroding profile is a drainage or detailing clue. Clean the deposit only after the source has been recorded and assigned for correction.
Traffic film, grease and soot
Use a manufacturer-approved neutral cleaner or degreaser on a test patch. Work with separate clean and rinse tools; one contaminated cloth can spread a thin grey film across several panels.
Organic growth
Confirm whether the growth is on the panel, in a joint or fed by persistent moisture. Select a biocidal treatment only after the slab finish, sealant, gasket, coatings, runoff controls and local environmental rules have all been checked.
For indoor marks, named products and measured spot methods, use Funtek’s separate sintered-stone cleaning guide. Those countertop doses should not be copied automatically onto a facade where sealants, membranes, metal finishes, landscaping and uncontrolled runoff are present.
Check Cleaner Compatibility Across the Whole Facade Assembly
“Safe for porcelain” is only the first line of the compatibility review. The cleaner, dilution, dwell time, agitation tool and rinse method also contact panel edges, joint sealants, EPDM separators, anodized or coated aluminium, glass, flashings, gaskets and sometimes the water-resistive barrier or insulation through open joints.
Issue a short cleaner approval sheet before access work begins:
- exact panel product, finish and any decorative surface layer;
- cleaner trade name, current TDS/SDS, dilution, dwell time and rinse instruction;
- panel-manufacturer approval for that finish and residue type;
- sealant/gasket and metal-finish compatibility, including a statement on staining, softening, swelling or adhesion loss;
- test-panel location, dry before/after photographs and 24-hour review;
- runoff collection or diversion method and protection of glass, entrances, planting and stormwater;
- operator PPE, access method and stop conditions.
A US VA joint-sealant specification hosted by the Whole Building Design Guide requires cleaners for non-porous surfaces to be compatible with the sealant and backing and free of residues that harm substrates or interfere with adhesion. That principle matters during maintenance too: a cleaner that leaves the panel bright but weakens or contaminates a working joint has failed the facade task.
Keep hydrofluoric-acid products out of the method, and never mix cleaning chemicals; obtain written compatibility for acids, solvents, chlorine products or biocides before they reach joints, metal or runoff paths.
Use High-Pressure Water Only After a System-Specific Trial
A pressure washer is not automatically prohibited, and it is not automatically safe. Cosentino’s facade manual permits high-pressure rinsing for the named Dekton system while also requiring protection of panels, anchors and joints. A US GSA facilities account chose low-pressure soft washing because pressure washing could damage the building facade. The difference is the assembly, condition, nozzle, distance, operator and water path—not the marketing category of the facing alone.
Use a low-pressure hose and soft agitation as the default. If the approved O&M method allows a pressure washer, use this release sequence:
- obtain the selected panel/system instruction and cleaner approval sheet;
- inspect the test bay dry and hold any cracked, displaced, open or failed-joint area;
- use a fan nozzle at the machine’s lowest effective setting, beginning at the greatest practical stand-off distance;
- keep the spray on the panel face and direct it away from open joints, exposed panel edges, window perimeters, vents, drains, sealant transitions and visible fixings;
- do not use a pencil jet, turbo nozzle or close-range cutting action;
- stop if a panel vibrates, a joint changes, fines appear in runoff, water enters the cavity unexpectedly or the finish changes;
- inspect the patch after rinsing, when dry, and again after 24 hours before expanding the method.
Do not write one universal psi, bar or nozzle distance into a generic facade article. Equipment pressure is not the pressure delivered at the surface, and a value acceptable for one tested panel face may still force water through another project’s open joints or damage aged sealant. The controlled trial and selected-system document are the measurable release gates.
Inspect Joints, Fixings, Drainage and Panel Movement
Cleaning access is an efficient time to inspect the parts that routine ground viewing cannot resolve. On an open-jointed rainscreen, check whether joints are continuous and free of sealant smears, vegetation, nests, construction debris or hardened wash residue. At sills, copings, base details and cavity outlets, confirm that water can leave through the intended path and that the stain pattern is not tracing a blocked or corroding detail.
For sealed joints, record adhesion loss at either edge, cohesive splits through the sealant, hardening, softening, bulging, recess, staining and failed perimeter transitions. Do not fill an open rainscreen joint because it “looks unfinished,” and do not bridge a movement joint with rigid patching.
Most anchors and clips are concealed. Inspect only what the access design and O&M manual make observable: panel alignment, joint-width change, clip position visible through a service joint, fastener corrosion, rail movement, gasket displacement or evidence that a panel has contacted its neighbour. A borescope can document a visible cavity condition where access is permitted. It does not authorize loosening, tightening, levering or drilling a facade component. Use Funtek’s facade installation anatomy when the maintenance team needs to identify the panel, clip, rail, bracket, cavity and base-wall layers before assigning an observation.
Compare suspect panels with the fixed elevation photographs and adjacent joint lines. A straightedge, laser or repeat photograph from a controlled position can document out-of-plane change without pushing on the face. If movement is suspected, let the engineer define the restraint, access, non-destructive testing and opening-up plan.
Record What Must Be Known Before Replacing a Damaged Panel
Replacement begins with the reason for removal. An impact chip at an exposed corner, a through-crack, a visibly displaced panel, a failed fixing and a recurring water stain are different problems. Replacing the face without finding the failure layer can put the new panel back onto the same unsafe or leaking condition.
Assemble one replacement pack before ordering or removing anything:
- elevation, floor/grid and panel ID, with current photographs and the original approved elevation;
- slab manufacturer, product/colour, finish, thickness, production or shade reference, face orientation and approved visual control;
- finished panel dimensions, edge treatment, cut-outs, corner details, backing or mesh, hole/anchor geometry and fabrication drawing revision;
- fixing family, clip/anchor/rail/bracket details, fasteners, isolators and the approved removal/reinstallation sequence;
- joint type and width, sealant/gasket/EPDM identity and the drainage/ventilation path that must be reinstated;
- adjacent-panel condition, access route, lifting points, temporary restraint, exclusion zone and weather limits;
- fire-stopping, cavity barriers, membrane, insulation or flashing exposed by the work and the inspection sign-off required before closure;
- spare-panel location and condition, or the full-size replacement sample and project-side visual approval when the original lot is unavailable.
Funtek project note — visual replacement control: In one Funtek hospitality reorder, the original production lot was no longer available. A first candidate lot was held after slab-scale comparison showed a visible tonal difference from the retained project reference; another candidate was released only after project-side visual approval. That project involved tabletops, not a facade fixing system, but it establishes the visual-control lesson: retain finish, production reference and approved visual evidence, not only the SKU. Portobello’s facade maintenance manual likewise recommends using material from the technical reserve to reduce shade variation during replacement.
Stop Routine Maintenance and Call a Facade Engineer When
Escalate immediately when the observation can affect stability, water management, fire-safety continuity or safe access. A facilities team should not wait for the next scheduled wash when any of the following is present:
- a panel is out of plane, has shifted relative to the joint grid, rattles in wind or moves under non-contact observation;
- a through-crack reaches an edge, anchor zone, cut-out or corner, or a fragment has fallen;
- a clip, fastener, bracket or rail is missing, displaced, visibly corroded or no longer seated as shown in the approved detail;
- several adjacent joints change width, close, open or lose sealant together;
- water entry is active, recurrent or spreading, especially around openings, penetrations, parapets or floor lines;
- a storm, impact, fire, nearby structural work or access-equipment contact may have changed the load path;
- the wall build-up, fixing type, fire-stopping or original drawings cannot be established before opening or replacing panels;
- cleaning access would require an unapproved anchor, restraint, platform reaction or removal of a facade component.
For a displaced, cracked or unstable panel, stop access below the area, establish an exclusion zone and let a qualified facade or structural engineer define temporary restraint, investigation and repair.
Turn Every Visit Into a Maintainable Facade Record
Close the work order with a marked elevation, dry before/after photographs, access location, weather, cleaner and dilution, tool/nozzle, dwell time, rinse method, observations at joints and drainage, panels held from cleaning, repairs opened, repairs completed and the next due date. Keep the current panel schedule, O&M manual, approved system drawings, cleaner register and spare-panel inventory together.
The record should also say who owns the next action: facilities team for routine cleaning, facade contractor for an approved repair, panel supplier for product/finish evidence, access contractor for safe reach, and the facade or structural engineer for stability, fixing, movement and replacement approval. That makes the next inspection comparable and prevents an appearance complaint from becoming an untracked system change.