Listen to We're Gonna Hang out the Washing on the Siegfried Line online. We're Gonna Hang out the Washing on the Siegfried Line is an English language song and is sung by Flanagan and Allen. We're Gonna Hang out the Washing on the Siegfried Line, from the album A Retrospective Flanagan and Allen, was released in the year 2013. The duration of the song is 2:46. Download English songs online from JioSaavn.