Brick and patio cleaner is an acid-based solution used to remove cement and mortar stains, efflorescence, limescale, algae, moss, oil, and general grime from external masonry surfaces. It works on brickwork, block paving, concrete paths, patios, and paved driveways. It is particularly useful after building work when mortar splashes are left on freshly laid bricks or paving.
Remove Mortar, Moss and Stains from Brick and Patio Surfaces
Brickwork and paved surfaces take a real battering outdoors. Mortar splashes left after laying, efflorescence creeping across the face of blocks, green algae building up over winter — none of it shifts with a garden hose alone. MacBlair stocks a range of building chemicals including acid-based brick and patio cleaners suited to exactly these jobs, available in multiple sizes to cover anything from a small clean-up to a full site restoration.
The cleaners in this range tackle a wide variety of surface problems on external masonry and paving:
- Cement and mortar stains on brickwork and blockwork
- Efflorescence and limescale deposits
- Algae, moss and green growth on patios and paths
- Oil and grease on concrete floors and driveways
- General grime on block paving and paved areas
Application is uncomplicated. Wet the surface first, apply the cleaner by brush or low-pressure spray, leave it to work, then scrub with a stiff brush and rinse thoroughly with water. Always wear gloves and eye protection — these are acid-based products and contact with skin or eyes should be avoided. Keep run-off away from drains, plants, and waterways. Check the product datasheet before use on natural stone, as some surfaces need a patch test first.
After cleaning, it is worth considering whether the surface needs further attention. New or repointed mortar joints may call for damp-proofing or waterproofing treatment to protect against future moisture ingress. If the project involved laying new paving or brickwork, concrete additives and dyes are also stocked in the chemicals range at MacBlair.
Brick & Patio Cleaner FAQ's
Always wear protective gloves and eye protection before handling these products, as they contain acid. Wet the surface with water before applying the cleaner, then brush or spray it on and leave it to dwell for the time specified on the product label — usually 10 to 20 minutes. Scrub with a stiff brush and rinse thoroughly with clean water. Keep run-off away from drains, waterways, and plants, and never mix the cleaner with other chemicals.
Used correctly and according to the manufacturer's instructions, brick acid cleaner will not damage most acid-resistant brickwork, blockwork, or concrete paving. However, it is not suitable for all surfaces. Natural stone, such as limestone or sandstone, can be sensitive to acid-based products, so always test a small, hidden area first. Avoid using on coloured or pigmented concrete, as some colour loss may occur.
Yes. Brick and patio cleaners are effective at removing algae, moss, and general green growth from outdoor surfaces including patios, paths, and block paving. Apply the cleaner to the affected area, leave it to work, and then scrub and rinse off. For heavy or recurring organic growth, more than one application may be needed. Regular cleaning helps prevent build-up returning quickly.
No, a pressure washer is not required. A stiff-bristled brush and a garden hose are sufficient to apply and rinse off brick and patio cleaner in most situations. That said, a pressure washer can speed up rinsing and help lift stubborn staining, particularly on larger paved areas. If using a pressure washer, keep the pressure on a lower setting to avoid damaging mortar joints or the surface itself.