"Soap" was premiered exclusively on ELLE magazine's website on July 10, 2015. The electropop, indie pop and dream pop track[6] was released as the second single from Melanie's debut album, Cry Baby. 　　In the interview with ELLE, Melanie described the song, "Soap was written about my current boyfriend when we were first talking, I felt too scared to say how I felt about him and thought if I told him it'd be like throwing a toaster in his bath. So I washed my mouth out with soap. I think anyone can really relate to this song. I'm sure there was a time in everyone's life where they felt too scared to say how they felt so they 'washed their mouth out with soap'". She continued, "Everyone is allowed to be vulnerable. I think women and men and dogs and cats and ants and aliens can all express themselves and be vulnerable".