9 Signs Your Property Needs Pressure Washing

1. Green or Black Mould Appears on Exterior Surfaces

Green or black mould growth is one of the clearest indicators that pressure washing is required.

Mould and algae develop quickly in damp or shaded areas and spread across surfaces such as exterior walls, fences, driveways, and roofs. Over time, this growth creates dark staining and can gradually weaken surface materials.

Professional house washing removes mould and organic buildup from exterior walls, restoring their original appearance. Roof surfaces affected by algae or lichen also benefit from specialised roof cleaning that removes biological growth safely.

2. Concrete Surfaces Become Slippery

Slippery driveways and pathways often indicate algae buildup that requires pressure cleaning.

Algae forms a thin film across concrete surfaces. When wet, this film becomes extremely slippery and increases the risk of slips or falls. This problem commonly occurs on shaded driveways, pool surrounds, outdoor steps, and pathways.

Targeted concrete cleaning removes this layer of algae and restores traction to outdoor surfaces.

3. Dark Stains Appear on Exterior Walls

Dark streaks or patches on exterior walls indicate accumulated dirt, pollution residue, and biological growth.

Rainwater often carries dust, pollutants, and organic particles down walls, leaving streaking or patchy staining on painted surfaces, render, and brickwork. These stains gradually make a property appear aged or poorly maintained.

Professional pressure washing removes the contaminants responsible for staining and restores the appearance of the exterior.

4. Your Roof Looks Discoloured

Roof discolouration often indicates algae, lichen, or environmental debris buildup.

Tile and metal roofs frequently develop dark streaks caused by airborne spores and organic growth. These contaminants trap moisture and accelerate surface deterioration if left untreated.

Professional roof cleaning removes buildup safely and restores the appearance of roofing materials. For tiled roofs, specialised tile roof cleaning targets lichen and moss growth effectively.

See our roof pressure cleaning before and afters to see how much of a difference can be made.

5. Cobwebs and Dust Build Up Around Eaves

Cobwebs around eaves, corners, and outdoor fixtures indicate general exterior buildup.

Dust and debris accumulate around sheltered areas such as rooflines, gutters, light fittings, and window frames. These areas trap moisture and become ideal environments for insects and spiders.

Pressure washing removes accumulated dust and webs while restoring a clean finish to exterior surfaces.

6. Your Windows Stay Dirty After Rain

Windows that remain dirty after rainfall often indicate contamination on surrounding surfaces.

Dirt and organic buildup on walls, gutters, and frames easily transfer onto window glass during rain. This causes streaking and cloudy patches even after rainfall.

Combining exterior pressure washing with professional window cleaning improves overall results and prevents residue from spreading onto glass surfaces.

7. Gutters and Fascias Show Staining

Visible streaks along gutters and fascia boards indicate runoff carrying contaminants from roofs and surrounding surfaces.

Leaves, pollen, and airborne debris gradually break down and leave staining as water runs off the roof. These marks often appear as vertical streaks beneath the roofline.

Pressure washing removes these stains and restores the appearance of gutters and fascia boards.

8. Exterior Surfaces Look Dull or Faded

A dull or grey appearance across exterior surfaces often signals widespread dirt accumulation.

Pollution residue, dust, pollen, and organic debris gradually form a thin layer across walls, driveways, and outdoor areas. Even without obvious stains, this buildup can make a property look older than it is.

Pressure cleaning removes this layer of contaminants and restores the natural colour of exterior materials.

9. It Has Been More Than 12 Months Since Your Last Clean

Exterior surfaces accumulate contaminants continuously, making regular pressure washing an effective maintenance routine.

Most properties benefit from pressure cleaning every 6 to 12 months depending on environmental exposure, surrounding vegetation, and weather conditions. Regular cleaning prevents buildup from becoming embedded in surfaces and reduces long-term maintenance.