An Introduction to ‘Soft Washing’ of exterior surfaces:

Why “Soft Washing” ?
Pressure washing: A fast but aggressive form of cleaning and can easily damage building materials like render by effectively ripping organic growths off surfaces. Pressure washing must be used with discretion. In addition, cleaning off organic growths with a pressure washer may give a temporary ‘clean’ effect but has merely moved the dirt to another location. Regrowth will occur rapidly. Pressure washing leaves tramlines on surfaces in the process. Pressure washing can have a catastrophic effect on roofs damaging the surface and forcing water under tiles etc.

Soft Washing: Gently cleanses surfaces by the low pressure application of specific cleaning chemicals.
Window cleaning companies use virtually the same process through their water- fed poles.
Most dirt and grime seen on exterior render or masonry surfaces is a result of colonisation of algae, lichen, fungi, moss or mould. This gives rise to unsightly — and often dangerous and damaging — red, black and green staining seen on external surfaces.
This colonisation is known as “biofilm”. The biofilm requires a high level of moisture for active growth but once established it can withstand drying out without dying. As well as looking unsightly, acidic excretions from these organisms can erode and damage traditional and modern renders and building surfaces.
Our Softwash products are used to clean exterior surfaces and periodically maintain them.
Using two very different biocides – both fully approved by the UK Health & Safety Executive (HSE) most exterior surfaces can be kept relatively sterile and free from recolonisation.
All the chemicals we use are compliant with the European Regulation, Evaluation, Authorisation and Restriction of Chemicals (REACH) and HSE.
Generally the primary solution is used as an initial cleaner particularly on surfaces with well established colonisations. This biocide kills and oxidises the biofilm/ moss etc. producing fast cleaning results. Once the surfaces are clean, rinsed and free from the worst of the biological material, the Biocidal Wash can be applied to provide residual protection.
This procedure is known as ‘The Clean and Protect System’.
This biocide can also be applied at the first signs of re-colonisation or as part of a maintenance program.
The biocide can be used as a stand — alone cleaner in some instances. After application, surfaces will self —-cleanse over a period of months through natural weathering.
Both chemicals are bio degradable and use only enough active ingredient to produce excellent cleaning results,  the primary solution degrading within hours. The biocide has a residual effect and lasts several months as it only degrades when in contact with living organic material. The biocide wash is less dense than water and is able to penetrate more deeply into porous surfaces, thus killing remaining spores embedded in the substrate.
Both cleaners are safe to use on all known building materials including PVC, paint, polythene, timber, metals etc.
The biocide is used on listed historical buildings — National Trust etc.
The process is ideal for preparing render for painting. All works are subject to an on site survey where a full risk assessment will be carried out and to discuss with the client what is required and expected. The procedures are explained as are the steps the client can take prior to commencement of the cleaning. A quotation can then be drawn up.

Materials that can be cleaned by our softwash process

Render – including K Rend / Monocouche / Sand & Cement / Silicone & Paint.
Sandstone / Limestone / Granite etc.
Poly tunnels.