Letter 40015 3 to 5 year black ring and bleached water stain 24inch oak window sills ++++++ Ya thats 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