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1544 posts

Uber Geek


# 214026 24-Apr-2017 14:52
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I'm nuking some green patches on our newish deck. I got some generic moss/mould/gunge cleaner from the number 1 red shed.

Anyway instructions say to spray and then hose off after 60 seconds. Last time I got the spray and walk away type.

Are there any downsides to leaving the stuff on for a while or until it rains?

I can't see any reason why you would spray it, leave for 60 seconds and then hose off. Especially since it was probably on the deck for 15 minutes by the time I had sprayed the entire deck.

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  # 1769806 24-Apr-2017 14:57
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I'm not and expert but I think its something like this.


The hose off after 60sec are generally a bleach based system (hypochlorite or similar) and would probably have corrosive effects on metal fittings if left longer the chlorine disappears fairly quickly.


The spray and walk away/wet and forget type products have a different active ingredient, its slower acting but probably less corrosive. 

1544 posts

Uber Geek


  # 1769820 24-Apr-2017 15:11
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Ah looks like you are right.


Critics of bleach-based cleaners say they badly damage wood fibres and give timber a washed-out (or bleached) look. It’s also corrosive to metal nails and screws. - See more at:


3212 posts

Uber Geek

  # 1769837 24-Apr-2017 15:31
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Get proper deck cleaner or use the spray and walk away stuff.

Always be yourself, unless you can be Batman, then always be the Batman


51 posts

Master Geek

  # 1771240 27-Apr-2017 13:41
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Critics of bleach-based cleaners say they badly damage wood fibres and give timber a washed-out (or bleached) look. It’s also corrosive to metal nails and screws. - See more at:



I recently used option 4 from this link to clean our fairly large deck that hadn't been cleaned for some time, if ever.  Purchased a tub of sodium percarbonate (active ingredient in 'Hit the Deck' and those 'oxy' laundry treatments) from Trademe for cheap.  Over the course of a few evenings I sprayed section by section, waited 30 minutes or so, scrubbed with a stiff broom and hosed off.  Possibly more effort than others, but it worked very well!

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