I discovered a few years back that I had been cleaning my house incorrectly. A maid entered my hotel room and sprayed a substance on every surface before leaving. She came back just when I thought she had forgotten. She used a thin, dry towel to wipe for less than two minutes, and then everything was sparkling. I questioned her about the method she had employed because, to be honest, I had never thought to allow one solution do all the job. It was...