Sodaneck on Instagram: "In the early 1970s, Calgon released its now-famous "Ancient Chinese Secret" commercial, which continued to air into the early 1980s. The advertisement features a Chinese-American couple running a laundry business. When a customer inquires about their impeccable cleaning results, the husband attributes it to an "ancient Chinese secret." However, his wife reveals the true secret: Calgon water softener. This commercial became iconic, with the phrase "Ancient Chinese secret,