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How Bio-Shield Works

Clean up moss, mould and lichen with Bio-Shield®

Moss, mould and lichen discolour and damage exterior surfaces around the home, making concrete and asphalt driveways, paths, patios and timber decks slippery and dangerous.
Falling over on slippery paths is a major cause of injury accidents at home. (source: Accident Compensation Corporation 2012

When present on roofs these growths attack the surface, damaging Coloursteel, Decrabond and Asphalt stone-chip coatings and eating away mortar joints and cement based colour coatings on modern concrete tile roofs.

Moss Removal, Lichen Removal and Concrete Cleaning with Bio-Shield® is Easy
A single one-off application of Bio-Shield® with a garden sprayer or watering can, kills growths quickly. 
The dead growths are removed by rainfall without damaging the treated surface and Bio-Shield® can then keep the treated surface clean for up to 2 years.
While chlorine-based products such as '30 Seconds' work quickly on concrete, they are broken down rapidly by sunlight so will give no residual protection. These chlorine-based (bleach) products will require more frequent applications to keep the treated surface clean.
Bio-Shield® is not chlorine-based and gives extended protection to a treated surface once it is clean.
This means less-frequent applications and lower costs.

How Bio-Shield® Works
Bio-Shield® is a biodegradable bio-cide that selectively kills moss, mould, lichen and bacteria on any exterior surface. When diluted with water and applied, it immediately starts working to kill unsightly growths. As a result of natural weathering from rain and wind, the dead growths are gradually removed and flushed away without damaging the surface.
The cleaning process on concrete will take 2 to 4 months.
On other surfaces it can take from 3 to 12 months depending on the level of growth present, the type of surface, and total rainfall over the cleaning period.

Exterior cleaning with Bio-Shield® is safe, easy, and won't cause any damage to the surface being treated. Bio-Shield® won't kill plants so is safe to use in proximity of plants and gardens.

Limitations of Bio-Shield
Bio-Shield will kill moss, mould and lichen on any surface, however to effect a complete clean up the surface must be exposed to rain and weathering. If the treated surface is frequently shaded by overhanging trees or buildings or the treated roof surface is under TV aerials or below downpipes from upper roof levels, the surface may need frequent applications to keep the surface clear of growth.
The length of time between applications will vary with the situation and micro-climate around the treated surface.

Benefits of using Bio-Shield® for exterior cleaning.

  • Just apply the Bio-Shield solution and the jobs done - no water blasting or scrubbing is required.
  • Bio-Shield® keeps the treated surface clean for longer than water blasting or chlorine-based cleaners alone, up to 2 years or longer in some situations.
  • Concentrated and cost effective - a 5 litre bottle of Bio-Shield®  makes up 105 litres at a cost of just
    94 cents per litre!
  • Compare the price of Bio-Shield® to other outdoor cleaners.
  • FREE New Zealand wide delivery
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Bio-Shield ® Application Service

If you have a large area to be treated or are not confident walking on your roof or applying Bio-Shield yourself, we offer an application service in the Auckland region, at very competitive prices or can refert to regional Bio-Shied Applicators near you.
Contact Andy directly on;

Telephone:  NZ 0800 800 127

Visit the Roof Cleaning Ltd Ltd website for info about roof cleaning with Bio-Shield.

Discounts, special offers, new arrivals
Bio-Shield is a New Zealand owned company based in Auckland.
I have personally developed and used Bio-Shield for over 38 years to successfully remove moss, algae and lichen from just about every exterior surface on domestic, commercial and industrial properties. 
The same high quality product is now available for DIY and commercial use on homes and businesses throughout New Zealand.
We are committed to supplying our customers the best outdoor cleaning product and services at the best price, complimented with the best technical advice in New Zealand.

7 Days - 9am to 5pm
NZ :   0800 800 127 
AU :  1800 236 810
FAQs - Ask Andy®
Instructions For Use