During the 1960s, he was ubiquitous as a voiceover actor in television commercials for foods and household products, most notably for Chiffon margarine and Crest toothpaste ("Helps stop cavities before they start"). He also did the vocal part of the television commercials for Smucker's preserves ("With a name like Smucker's, it has to be good!"), a role he resumed in his later years. Beginning in the 1980s, Adams provided the voiceover for Cadbury Creme eggs, which were advertised on television with Adams' catchy slogan, "Nobunny knows Easter better than him [the Cadbury Bunny]." Also in the 1980s, Adams did voice-over TV commercials for Sherwin-Williams Paints. Adams also did radio commercials for the Salvation Army. In addition, Adams was the narrator for Kix commercials in the 1990s as well as a few Dentyne commercials and a few Swanson commercials. He was also the announcer for a 1992 WCBS-TV news promo, as well as a 1986 Lysol commercial. In the early 1990s, he narrated The Discovery Channel series on milestones of aviation called "Frontiers of Flight". In one of the early episodes of Sesame Street, he voiced a cartoon featuring a "jazzy" triangle and a "square" square. He voiced those two, as well as being the narrator, with jazz music in the background. This cartoon was repeated on the show for many years, well into the 1980s.