Irish Spring is the brand name of a deodorant soap, first marketed by the Colgate-Palmolive company in 1972. Up until the 1990s, Irish Spring soap bars only came in one scent (known internally as 'Ulster Fragrance'), but the Colgate company has since branched out into several niche varieties and scents. Also, Irish Spring deodorants and shaving products were manufactured until the 1980s. In 2007, Irish Spring body wash was introduced. In addition, in 2011, Irish Spring deodorant was reintroduced as part of Colgate-Palmolive's Speed Stick brand of products. In 1986, the soap changed its formula, including a different scent, and adding skin conditioners.
Contributions by Mike Halterman, 220.127.116.11, and 18.104.22.168.