Cleaning and Sealing Brick Slips: Product-Specific Care

Find the slip name, mortar, installation date and details of any previous surface treatment. A photograph is useful, but it may not show whether a coating has already been applied. Keep spare slips or the original sample panel if you have them: they provide a place to compare a proposed treatment without committing the whole wall.

If you are still choosing from our brick slips range, include care in the decision. A creased product such as TBS Sandalwood has a different visible surface from a smooth finish. Ask how its actual face and the intended mortar should be cleaned in your planned location.

For light household dust, ask the supplier whether gentle dry cleaning with a soft brush or soft vacuum attachment suits the finish. Check a small area first, especially if the surface looks friable or has a decorative coating. Avoid forcing tools into the joints. Persistent shedding or loose material deserves assessment rather than increasingly vigorous cleaning.

For grime, obtain a suitable cleaning method and try it inconspicuously before extending the area. Wienerberger’s brick-cleaning guidance warns against wire brushes and high-pressure washing because faces and mortar can be damaged. An internal adhered wall also needs care around floors, fittings and the supporting construction; do not flood it to imitate cleaning external masonry.

If marks appeared during fitting, identify the material and speak to the installer before applying a household cleaner. Adhesive residue and mortar smears may require different responses. Keep the relevant product instructions available and agree the intended result on a test area. Preventing further marks while work continues is often the most useful first step.

The BDA cleaning guide treats different deposits separately and emphasises care with cleaning techniques. It is background guidance for clay brickwork, not blanket approval of a chemical on an adhered slip system. Do not use a general acid-cleaning recipe. The slip, mortar, backing and surrounding materials all need consideration.

White marks are not enough to identify the cause. Wienerberger distinguishes soluble salt deposits from lime staining, which can look similar but needs different assessment. Photograph the pattern, note when it appeared and whether it returns after cleaning. That history helps the supplier or installer decide what to investigate.

If a wall also shows damp patches, cracked joints or loose slips, address those symptoms before considering a coating. Ask whether the source is associated with installation moisture, an ongoing leak or another building issue. A stain-removal product may change the appearance without resolving the underlying cause; repeated applications are not a diagnosis.

Start with the outcome you want: easier stain removal, a particular sheen or a change in colour depth. Ask the slip and sealer manufacturers whether the exact product combination is suitable, including the mortar and any existing treatment. Request preparation, curing, application and future maintenance instructions for that use.

Historic Environment Scotland’s brick conservation guidance cautions that sealants can trap moisture. Although an old solid brick wall is different from modern slip cladding, this is a useful reason to ask about moisture behaviour rather than assume every coating helps. A sealer does not replace the waterproofing design of a wet area, the weather details of an external system or fireplace approval.

Test the proposed product on the real combination of slip and mortar in an inconspicuous area or representative panel. Follow the manufacturer’s test and drying instructions, then compare untreated and treated areas in daylight and artificial light. Look for darkening, sheen, uneven absorption and a change in the contrast between joints and faces.

An approved-looking sample on a single flat face may not show what happens in creases or at mortar edges. Record the product, dilution if specified and application method so the result can be repeated. If the effect is unacceptable or compatibility remains uncertain, stop at the trial rather than committing the wall.

Retain product labels and the approved cleaning method with the installation notes. Use the treatment manufacturer’s guidance to decide whether later renewal is needed; there is no single annual resealing rule for all brick slips. When bringing in a cleaner or decorator, share this record before they choose products.

For a new project, settle care expectations while approving the mortar and trial panel. For splash-prone areas, read the kitchen and bathroom guide. For outside walls, use the external-use guide to keep cleaning decisions consistent with the installed system.