joe90 Posted July 8, 2020 Share Posted July 8, 2020 I love my Oak conservatory but externally some black stains are appearing, particularly the cills. It was treated with three coats of Osmo UV protection oil. Some reading tells me it can be treated with oxalic acid but is mostly for treating oak with iron stains. Is this the best treatment to be followed by more Osmo UV protection oil? Link to comment Share on other sites More sharing options...
nod Posted July 8, 2020 Share Posted July 8, 2020 (edited) Brilliant stuff I bought two tubs to treat our oak porch Cheap as chips It came up like new Edited July 8, 2020 by nod 1 Link to comment Share on other sites More sharing options...
nod Posted July 8, 2020 Share Posted July 8, 2020 2 minutes ago, nod said: Brilliant stuff I bought two tubs to treat our oak porch Cheap as chips It came up like new 1 Link to comment Share on other sites More sharing options...
Temp Posted July 8, 2020 Share Posted July 8, 2020 2 hours ago, joe90 said: I love my Oak conservatory but externally some black stains are appearing, particularly the cills. It was treated with three coats of Osmo UV protection oil. Some reading tells me it can be treated with oxalic acid but is mostly for treating oak with iron stains. Is this the best treatment to be followed by more Osmo UV protection oil? How long ago was it done? Link to comment Share on other sites More sharing options...
joe90 Posted July 8, 2020 Author Share Posted July 8, 2020 36 minutes ago, Temp said: How long ago was it done? 9 months. Seen one winter. Link to comment Share on other sites More sharing options...
Triassic Posted July 8, 2020 Share Posted July 8, 2020 I was very sceptical about oxalis acids ability to clean up badly marked and black stained oak. One application was enough to get rid of the majority of the stains, two applications and a nylon bristled brush and the worst stains were gone. Give it a try, you have nothing to looose 1 Link to comment Share on other sites More sharing options...
joe90 Posted July 9, 2020 Author Share Posted July 9, 2020 Said chemical duly ordered and on its way, thanks guys ? Link to comment Share on other sites More sharing options...
epsilonGreedy Posted July 9, 2020 Share Posted July 9, 2020 3 minutes ago, joe90 said: Said chemical duly ordered and on its way, thanks guys ? The same chemical is rebottled as expensive teak deck cleaner for boats, I have used it many times and the transformation is remarkable. I don't know if the extra additives in the yachtie version make a difference, it is usually sold as a two bottle two stage cleaning process. https://www.amazon.co.uk/Wessex-Teak-Cleaner-Renovator-parts/dp/B00B6BKS8G Link to comment Share on other sites More sharing options...
joe90 Posted July 9, 2020 Author Share Posted July 9, 2020 13 minutes ago, epsilonGreedy said: The same chemical is rebottled as expensive teak deck cleaner for boats yes, Osmo sell a “wood reviver” product but it’s main ingredient is oxalic acid. Link to comment Share on other sites More sharing options...
Onoff Posted July 9, 2020 Share Posted July 9, 2020 If you've any old style Jenolite liquid, that contains phosphoric acid and works too but you can't do patches. It's the whole lot or nothing. 1 Link to comment Share on other sites More sharing options...
dpmiller Posted July 9, 2020 Share Posted July 9, 2020 would coke work then? Link to comment Share on other sites More sharing options...
joe90 Posted July 9, 2020 Author Share Posted July 9, 2020 10 minutes ago, dpmiller said: would coke work then? ha, I bet it does, cleans everything from copper coins to toilets, will try a bit ? Link to comment Share on other sites More sharing options...
Onoff Posted July 9, 2020 Share Posted July 9, 2020 Lemon juice... 1 Link to comment Share on other sites More sharing options...
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