Q. Our home was built about 20 years ago. In our living room, which has a cathedral ceiling, we had a cedar ceiling installed. A few years later we had trouble with a leak in our roof because the ...

Black water marks and other dark stains can be removed from wood using oxalic acid. Black stains form when the natural tannic acid in wood comes in contact with moisture and iron. Since most water ...

Q: Thank you so much for your article on rust and oxalic acid ("Rust isn't her best color," Jan. 7). We have had this problem for years! And it is frustrating. We even have our water treated through ...