Metro water blasting blog

We specialise in residential and commercial water blasting, exterior building washing, low pressure house washing and outdoor surface cleaning. Our exterior cleaning services are guaranteed to meet New Zealand’s highest standards of quality. We are dedicated to providing excellent exterior cleaning services and exceptional customer service.

Why Moss Grows on Roof Tiles (And How to Stop It)

Kulwinder Smagh2026-03-14T10:21:22+13:00March 14, 2026|

Many homeowners notice patches of green moss appearing on their roof tiles and assume it’s simply part of aging. While moss growth is extremely common, especially in New Zealand’s damp climate, it can become a serious issue if left untreated. Roof moss is more than just a cosmetic problem. Over [...]

Why Exterior Walls Turn Green Over Time (And How to Remove the Stains)

Kulwinder Smagh2026-03-14T10:07:40+13:00March 14, 2026|

If you’ve noticed green stains slowly appearing on the exterior walls of your home, you’re not alone. Many homeowners across New Zealand see this happen over time, particularly on shaded sides of the house. What often starts as small patches can gradually spread across weatherboards, plaster, brick, or painted surfaces. [...]

Why Your Driveway Turns Black Over Time (And How to Restore It)

Kulwinder Smagh2026-03-13T08:13:59+13:00March 13, 2026|

Many homeowners notice their driveway gradually turning dark or black over time. What may have once been a clean, light-coloured concrete surface slowly becomes stained and dull. This change often happens so gradually that it’s easy to ignore — until the driveway looks noticeably dirty and worn. The good news [...]

Green Algae on Exterior Surfaces: Why It Happens and How to Remove It

Kulwinder Smagh2026-03-12T09:49:21+13:00March 12, 2026|

If you’ve noticed green patches appearing on your house, driveway, deck, or fence, it’s likely caused by algae growth. This is a very common issue for homes across New Zealand, especially in areas with regular rainfall and shaded environments. While algae may start as a cosmetic problem, it can eventually [...]

How Much Does House Washing Cost in New Zealand?

Kulwinder Smagh2026-03-11T17:06:00+13:00March 11, 2026|

One of the most common questions homeowners ask before booking exterior cleaning is: “How much does house washing cost?” The price of house washing can vary depending on several factors such as the size of the property, accessibility, and the level of dirt or mould buildup. Understanding how pricing works [...]

Soft Washing vs Water Blasting: Which Cleaning Method Is Right for Your Home?

Kulwinder Smagh2026-03-10T16:51:35+13:00March 10, 2026|

When homeowners look into exterior cleaning, two terms often come up: soft washing and water blasting. While both methods are used to clean exterior surfaces, they work very differently and are suited for different types of materials. Understanding the difference between these two cleaning methods helps ensure your property is [...]

Black Stains on Your Roof: What Causes Them and How to Remove Them

Kulwinder Smagh2026-03-09T13:55:31+13:00March 9, 2026|

If you’ve noticed dark streaks or black stains appearing on your roof, you’re not alone. Many homeowners across New Zealand see these marks develop over time and assume it’s simply dirt. In reality, those black streaks are usually caused by organic growth such as algae, mould, or lichen. While they [...]

Concrete Sealing: Why Sealing Your Driveway Protects Your Property

Kulwinder Smagh2026-03-06T08:52:55+13:00March 6, 2026|

Concrete driveways, patios, and walkways are built to last — but without proper protection they can deteriorate much faster than homeowners expect. In New Zealand’s climate, concrete surfaces are exposed to rain, UV radiation, moss, algae, and vehicle fluids. Over time these elements cause staining, surface erosion, and structural wear. [...]

Gutter Cleaning: Why Regular Maintenance Protects Your Home

Kulwinder Smagh2026-03-05T16:46:14+13:00March 5, 2026|

Gutters play a critical role in protecting your home from water damage. When they’re working properly, they direct rainwater away from your roof, walls, and foundations. But when gutters become blocked with leaves, moss, and debris, water can overflow and cause serious problems. Regular gutter cleaning is one of the [...]

Should You Wash Your House Before Selling? (2026 Guide for NZ Homeowners)

Kulwinder Smagh2026-03-04T08:42:10+13:00March 4, 2026|

If you’re preparing to sell your home, you’re probably thinking about: Repairs Staging Landscaping Photography Marketing But one of the highest return, lowest cost improvements you can make before listing is professional exterior cleaning. So — should you wash your house before selling? In most cases: absolutely yes. Here’s why. [...]

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