title: When does iOS clean the local app ./tmp directories?
body: <p>When does iOS clean the local app <code>./tmp</code> directory?</p>
  
  <p>Note that this is not a dupe of <a href="https://stackoverflow.com/questions/3593900/iphone-storage-in-tmp-directory">this question</a>. I'm asking about the app specific temporary folder, not the system wide one.</p>
  
  <p>You can use <em>iExplorer</em> to have a look at <code>./tmp</code> directories on non-jailbroken phones.</p>
  
  <p>(Note: <em>I'm asking this out of curiosity only. I kind of suspect that these never get deleted unless you restore your phone from a backup or reinstall that particular app. But obviously you cannot count on that for semi-permanently storing cached files.</em>)</p>