[noquacks]

Ever use dilute oxalic acid for tannic acid stains from oak tree? Have a cool deck around my pool, and it has an acrylic outdoor decking coating (paint??). Worth a try?

Thanks

 

[Jmayspaint]

Oxalic acid will tarnish metal, but I don't know of any reason you couldn't use it on an intact painted surface.

Hard to say how effective it would be, but I don't think it would be risky as far as damaging the paint.


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[joecaption]

I'd try an oxy cleaner before I used and acid on it.
http://www.oxiclean.com/versatile/landing.aspx
That's what composite deck manufactures suggest to remove tannin stains on decks.

 

[wptski]

Oxciclean did a better job of cleaning my old cedar than purchased wood cleaner.

 

[noquacks]

OK, well, oxiclean is basically drug store hydrogen peroxide, but hey, good idea! I didnt even think of that! Dump peroxide on the floor/deck, and rub it in.

 

[joecaption]

No, buy some oxyclean make it into a thin paste scrub it in with a stiff brush and rinse it off with a hose.