Chemwash History


The Chemwash story began in 1981 when a revolutionary new cleaning technique was brought to market, soft washing. The unique method utilised non-poisonous and non-toxic detergents to do all the ‘hard work’ that previously relied solely on high-pressure water blasting. Chemwash was the first company to use environmentally safe detergents and fan washing in their cleaning processes.

Chemwash remains 100% owned in New Zealand, forging pathways forward for home exterior cleaning across the country. Soft washing and high-water blasting still co-exist, but many of our fellow exterior cleaning companies have followed suit in adopting our soft wash low-pressure approach to exterior cleaning.

Why Chemwash

Chemwash detergents are all developed in-house by leading industry chemists who ensure all chemicals used are effective and 100% safe for surfaces, people, pets, and general vegetation. The product line used by our exterior cleaning experts effectively lifts away dirt, grime, and growth, including mould, lichen, and moss, from surface build-up.

Our detergents are suitable for residential, commercial, agricultural, and industrial surfaces with exceptional results. The wider Chemwash team continues to innovate to ensure we remain top of mind when consumers search for safe exterior washing services.

Chemwash Wellington: A Local Family Business

Steve & Denise Courtenay took a leap of faith and started their Chemwash branch in 1991. Based in Paraparaumu, they ran the Wellington western suburbs branch from home. The business employed its first staff member in 1993, and in 1998, Steve and Denise purchased the Wellington Eastern Suburbs branch.

In 2000, Steve & Denise had enough of the long commute to Wellington daily and moved to Papakowhai in Porirua City. For seven years, they joined forces with the Lower Hutt & Porirua branch until returning to focus solely on their branch in August 2007.

Steve & Denise’s son Sam came on board in 2007, fast-forward to today, and Sam remains one of the Chemwash Wellington Directors.

Our Cleaning System
Our Cleaning System

Our Chemwash Low Pressure Cleaning system is specialised for the cleaning of all exterior surfaces, without causing any damage.

Chemwash History
Chemwash History

Chemwash was formed in 1981 to market and apply a new cleaning technique, using non-poisonous and non-toxic detergents.

Our Guarantee
Our Guarantee

Our workmanship and your satisfaction are fully guaranteed. Looking after you and your property is our top priority.

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What our clients are saying



"We are absolutely thrilled with the clean your guys did at our house, we couldn’t be happier. I meet the two young men today when they finished off, they are a credit to you."