Render Cleaning in Gloucester, Cheltenham, Stroud and The Cotswolds

Algae on render can come in different forms and react differently to soft washing depending on the method used. We can decide which approach on our first visit and consultation.

Green stains disappear very quickly as they are often the first sign of organic staining taking hold. Red algae bursts with colour as the cells break down. Black staining is often a Metabolic stain that the Algae produces. It gives the algae UV protection and allows the algae to grow happily underneath. These are a little more stubborn and require rinsing between treatments. A hot wash down under low pressure is used to remove the built up organic matter and often Moss/Lichen that has started to grow on the renders surface.

An inconspicuous sample patch can be undertaken using the chosen method on the first site consultation to show the results achieved. A full report of methods used, with costings and safety measured are then forwarded to the client.


AlgoClear Pro is a high purity quaternary ammonium. It is a biocide working by contact with microbial life. It will act on small organisms by puncturing their cell walls. Its concentration is 40{5c9c73922720b4446aecf817a9001ffd78a24b39572d2921ac11dac279236530}. High Purity means the product does not contain solvents and will not affect silicone additives / sealants / coatings found in modern construction products. AlgoClear Pro is recommended by K Rend. AlgoClear Pro is surfactant: It is a powerful soap. The product foam on impact at low concentration. It will, when brushed and rinsed, remove grime from a surface as well as sanitising it.

Algoclear Pro does not contain aggressive or oxidising agents such as bleach, acid, lye etc. and is neither corrosive, nor bleaching.


MetaClear is a non penetrating gel formulated for removing black discolouration from render and masonry without impregnation. Brush on and rinse, the gel is fast acting and low odour.

MetaClear lubricates the brush and limits the risk of surface abrasion. The detergency is achieved through the action of sodium hypochlorite and the sequestration of impurities in the gel.

MetaClear is used before or after the AlgoClear treatment. If the surface is too contaminated, it is preferable to open the pores first and soak the render after. In many other instances, the AlgoClear treatment is carried out first and the remaining marks either left to recede naturally, or removed with MetaClear.

The delivery system consists in pumping the MetaClear up a pole into a brush. The product is then rinsed.

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