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 chemical used. Green stains can be gone within an hour, red will turn pink and disappear in 4-24 hours. Black staining will lighten to grey and continue to disappear over time, however we advised often applying a residual biocide to continue the cleaning process.

We can decide which approach on our first visit and consultation.


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.

If you would like to find out more or would like a no obligation quote, please call us on 01452 840 779 or use the form below.

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