def clean(self):
for s in self.visible_files.values():<EOL><INDENT>s.clean()<EOL><DEDENT>for s in [sub[<NUM_LIT:1>][x] for sub in self.avail_files.values() for x in sub[<NUM_LIT:1>]]: <EOL><INDENT>s.clean()                                                        <EOL><DEDENT>
Clear the data. For each ``YTStor`` object present in this object ``clean`` method is executed.