A friend loaned me a book I really wanted to read, but he was a heavy smoker and I'd have had to hold my breath while reading because the book reeked so strongly. A month or so in the sunshine (it was a very thick book), turning a few pages daily, made it usable. A sister-in-law did the same thing with her family bible after her heavy-smoker father passed away, putting it out on sunny days over about six months.