FAQ's - Roof and Exterior Cleaning

What product would you use to clean my roof and building ?

skyHIGH Roof and Gutter only uses Wet and Forget® Moss, Mould, Lichen and Algae remover in our softwash process. This process removes moss, mould, lichen and algae. It is not a high pressure wash and does not remove cobwebs, dirt and grime and other airborne contaminants. 

Can you clean my roof and house during Auckland's water restrictions ?

Yes we can !!! We use a 1000 Litre tank trailer full of rainwater collected from roofs outside Auckland's metropolitan water supply so we are fine to carry on softwashing.

Why use Wet and Forget® over other softwash spray solutions out there in the marketplace ?

Wet & Forget® Moss, Mould, Lichen, Black Fungi & Algae Remover has a unique combination of biodegradable selective surfactants for moss, mould and lichen removal on absolutely ANY exterior surface. 
Wet & Forget® Moss, Mould, Lichen, Black Fungi & Algae Remover is the safest, most effective way of removing these growths.

When diluted with water and applied, it immediately attacks those unsightly growths such as moss and mould. Each time it rains, this safe, cleansing combination reactivates to help flush away the moss and mould without scouring the surface it has infested.

Some products using other chemicals, notably sodium hypochlorite, may show quicker results initially, but they have no lasting long term activation properties. Wet and Forget® is designed to provide long term cleaning action and reactivates again each time it rains.

I am on tank water. Can i still get my roofs softwashed ?

Sure can. But you must disconnect the water supply to your tank for 3-4 weeks or have at least 36 ml of rain with a minimum of 6 ml to remove the concentrate. We recommend that you consider getting your local plumber in to install some diverters so you can easily stop any treated water from entering your tank. 

Check that the water coming off your roof is not foaming before you reconnect your water tank intake pipes.

Wet and Forget® has been used for over 35 years to treat biological growth on roofs.

How do you work around power lines ?

Many houses and commercial buildings still have power running from the power pole to the side of the house below the gutters. There are strict rules under New Zealand Electrical Code of Practice  ( NZECP 34:2001 ) regarding how close we can legally work next to power lines as there is significant risk of the electricity arcing to our cleaning equipment. 

We will cone off 4 m each side of the overhead power lines and go no closer than that during the cleaning process unless you organise for the power to be temporarily turned off to your house or commercial building whilst we are at work.

Please contact your Power Lines company should you wish this to be actioned. Refer to https://www.ena.org.nz/lines-company-map/ for more information. Normally there is no charge from the Power Lines for this however please note the time frame required to organise in advance.

We will need to meet the Power Lines Company representative on site as your power is disconnected prior to starting any clean where this has been arranged.

Please refer to our Terms and Conditions Section 5 regarding your responsibilities and potential costs that may be applicable in relation to Health and Safety and power disconnection non compliance.

How long does it take to Wet and Forget® to work ?

It is totally dependent on the intensity of the contamination. If it is really light you will see results within days. Otherwise it may take approximately 2-3 months to see improvements. Your concrete may turn an orange brown when the Wet & Forget® is applied. This is normal and shows there has been a good reaction. The discoloration will dissipate over a short period of time and is not permanent. The good news is that when applied again the following season, the clean up will occur within weeks. In the very worst case scenario where contamination is extreme, it may take 6-12 months.

When is the best time to apply Wet and Forget®?

On a cool, dry windless day and when no rain is expected for 4-6 hours. We recommend that you wash down outside tiles , timber steps etc after about 5 hours or so as sometimes these can get slippery after application. A simple hose down is all it takes if rain doesn't do the job for you. Same with windows - you can either hose them to clean off the residue, or just let the rain wash them of product.

Will Wet and Forget® damage my plants ?

It may be advisable to cover delicate plants close by with plastic or paper just to ensure they don't receive any overspray. Again a hose down after the wash is always a good idea. We carry some clean tank water for this at present during Auckland's water restrictions. 



Please contact us if you have any further questions.


skyHIGH Roof and Gutter Cleaning Limited.

507 Creightons Road, Ardmore, Papakura 2582

PO Box 69, Clevedon 2248


All business conducted is subject to our


Standard Terms and Conditions​

Tel: 021 951 719

Mon - Fri: 8am - 5pm

Weekends by arrangement. Urgent call outs are available

© 2019 by skyHIGH