Removing water tide marks in new oak

[RogerS]

Left the Veluxes open last night

Now have tide marks on my new oak joists. Will they sand out when dry or is there another remedy?

 

[Jake]

Oxalic acid is the usual thing to try.

 

[RogerS]

Thanks Jake. Neat or diluted?

 

[Jake]

Diluted. I've never had to use it on oak, but it's always mentioned. Here's some yank product with instructions: http://www.realmilkpaint.com/oxalic-acid-bleach.html