Clean up Play-framework based project

Question

After running a new Play-framework 2.0 based project, i failed to clean it - the generated staff persisted below,

 $ play new myapp
   > app          


        

Answer 1

clean-all no longer works.
All you need :

activator clean-files

See : https://www.playframework.com/documentation/2.3.x/PlayConsole

Answer 2

play clean-all

See http://www.playframework.org/documentation/2.0/PlayConsole