October 11, 2018
His question was: We have to clean a roof that is clad in sheets made of zinc. We are planning to use Benz Lightning Cleanze and want to know if it's compatible with, and safe to use on, a zinc roof?
We replied: Zinc is one of the materials you need to be very careful with. Like lead it can discolour if you do not protect it by pre and post wetting with fresh water. Zinc can go hazy if not looked after in this manner.
We've never cleaned a zinc roof with Lightning Cleanze, so cannot comment from experience. However, at 10:1 Lightning Cleanze is not classified as corrosive to metal, so should be ok. But it may still tend to slightly oxidise the zinc, so be careful.
As always, first treat a test patch to check that your method works on the zinc roof you intend to softwash.
In general, we recommend using Benz Bio Cleanze ("Biocidal Wash") at 40-50:1.
Apply two treatments to the zinc roof if the colonisation is severe, which will enable the product to soak more deeply into the biological growths than is possible with a single treatment.
After treating the zinc roof with Bio Cleanze, leave it (do not rinse) and allow natural weathering complete the cleaning.
We hope you found this information helpful.
Ben, Leo & Fiona
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September 15, 2021
Many soft wash contractors can be unsure of the safest way to soft wash asbestos roofs. So in this post we lay out the best practices we've learned from running a soft washing business since 2013.
Click the link on this page to learn how to treat asbestos ...
September 08, 2021
Ben demonstrates how to scrape moss and lichen from natural slate roof tiles and treat the biofilm to kill all the growths on this natural slate roof.
Click the link on this page to watch the how-to video ...
September 02, 2021 2 Comments
When soft washing it's vitally important to protect surrounding building materials. e.g. lead flashing. And not to create "clean streaks" – from overspray and run-off – on surfaces that are not part of your contract.
Click the link on this page to watch how we achieve this when soft washing a chimney ...
It's a free resource for people wanting to learn about the soft washing industry, to expand an existing business, or build a new business.
Soft washing reduces, or even eliminates, the need to use high-pressure washing.
Instead, once the build up of algae, lichen, fungus, moss and mould – the root causes of properties looking "dirty" – has been treated, the natural "self-cleansing" of sun, rain and wind removes the surface residue through time.
By educating the cleaning trade and public about soft washing we are helping develop an industry that offers sustainable treatments to clean and maintain exterior hard surfaces.
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