Cleaning black moul...
 

Cleaning black mould spots from wood?

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 ben
Posts: 81
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Morning all.

Some Teak wood on my boat isn't looking great after a winter outside. I think it's picked up some mould spots, seen on the photo below.

I think the answer is to sand it down as best I can, unless anyone has some other bright ideas?

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Posted : 24/04/2024 9:34 am
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I get lots of this on the hardwood garden furniture ... normally I oil over the top and it seems to do the job.

IANAWWE

@kayak23 and other types will probably give much better advice.

PS - you probably need to line up all your screw heads there 😉

 
Posted : 24/04/2024 9:38 am
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following. I sanded down and painted over a windowsill the other week and the paint has come off with an impressive pattern of mold under it.

 
Posted : 24/04/2024 9:50 am
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Oxalic acid is, I believe, the answer here. That will remove residual staining after you’ve sanded or scraped the varnish off. I’ve never used it on teak, usually oak, but a quick google suggests oxalic acid is still the right answer for teak. Just avoid getting any on your shiny metal hardware, may tarnish it.

 
Posted : 24/04/2024 9:55 am
 ben
Posts: 81
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Cheers All.

I've removed the doors for cleaning Reeksy, so will ensure better alignment of screw heads when I refit 😉

 
Posted : 24/04/2024 12:33 pm
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Try and avoid sanding, or you'll have nothing left in a few years!

Yes, oxalic acid or a proprietary teak cleaner once any varnish has been scraped off. Brings it up lovely!

 
Posted : 24/04/2024 1:48 pm
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Anothe rvote for oxalic acid, we used it to clean tea outdoor furniture after reading that it is the standard for cleaning teak decking on boats.

 
Posted : 24/04/2024 4:41 pm
 ben
Posts: 81
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Oxalic acid did indeed do the trick, thanks all. This is after 2 passes with medium strength, might give it one more pass.

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Posted : 28/04/2024 4:19 pm
kayak23, anorak, nuke and 3 people reacted