Sisters Jennifer and Katherine O'Neill got together with former school friend Matt Bick to form the band in 2009 in Forest Gate, London.
[4] By the end of 2009, Bleech had supported several top acts, including Wolfmother, The Charlatans, Pete Doherty, The Kooks and The Rifles.
In 2011, Bleech became the face of the Kangol Autumn/Winter 2011 campaign, which included a photo shoot with renowned music photographer Janette Beckman and a performance at the Aerial7 launch party in New York.
Days after the launch, they were announced as one of the support acts asked to perform at #ASH20, the 20th birthday celebration of Ash, hosted by Josie Long.
British super-middleweight boxer Frank Buglioni appeared in the band's "Break My Nose" video in October 2012.