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Pressure Cleaning

Mould Removal from Garden Walls and Retaining Walls

A careful approach to removing mould, algae and biofilm from garden walls without damaging brick, block or timber fences.

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Illustrative image (not a Spotless job): Mould Removal from Garden Walls and Retaining Walls
Illustrative image — not a photo of a Spotless job.

This Pressure Cleaning article is written for Melbourne owners and managers who need more than a quick blast. Pressure Cleaning jobs in our city require a surface diagnosis before any cleaning starts.

In Melbourne, everything from growth corridor new-build mortar smear to inner-suburb heritage brick has its own cleaning risk profile. The right method, chemistry and pressure keep the surface safe and the result lasting.

Identify the wall surface

Painted brick, rendered block and timber all require different chemicals and pressure settings.

Use biocide before pressure

A dwell period with the right biocide kills organisms and reduces the need for aggressive mechanical force.

Rinse gently and monitor

A final low-pressure rinse removes residue and limits the risk of washing fresh coatings off the surface.

On the job

  • Surface identification guides the safe cleaning method.
  • Biocide dwell reduces mechanical damage.
  • Gentle rinsing protects coatings and finishes.

Melbourne brick & exterior cleaning

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