Is this rug worth cleaning? If it’s wall-to-wall, hire a professional in-home carpet cleaner. But for wool, silk, cotton, Navajo, Turkish, Afghani, Berber, Chinese or other woven rugs, the answer can often be found on the blog Rug Chick. Lisa Wagner, Rug Chick herself, is an owner with her mother of K. Blatchford’s Rug Cleaning in San Diego. Ms. Wagner teaches rug cleaning to professionals; her next workshop, in McKeesport, Pa., is April 24 through 26. “I share our mistakes over the decades,” she said. Ms. Wagner was born into the business; her father, Don Blatchford — her parents are long divorced — is