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Black rings and bleached water stain on oak window sills of old bank

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Ya, that's right, someone had installed new windows in this old stone bank and left it sitting for 3 to 5 years. Now the new owner wants me to try to do something to bring it back to new. Well, like I said, there is a black ring around a bleached area. You can see where the sweat came of the window and sat on the 3/4 stained and poly oak. The sills are about 24 inches deep. I thought about sanding with 80 grit but I think I would still have the stain. Thanks.

Richard Gaudette
repair - Champlain, New York

March 4, 2011

Hi, Richard.

This is not within my actual personal knowledge, but I have heard that "oxalic acid", also called "wood bleach", can solve problems of this sort. I suppose it's worth a try. Good luck.

Regards,

Ted Mooney, P.E.
finishing.com
Brick, New Jersey

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