Belfiore has stated in recently that there’ll be a fix for the annoying ‘OTHER’ storage problem, whereby it eats up memory for no reason and there’s nothing really that users can do to fix it. This was later seen in firmware update screenshots with the latest news showing Nokia Lumia 620s already shipping with this feature.
The video below shows how clearing that temporary storage works on the Nokia Lumia 920. Ideally of course, you wouldn’t have to do any of this manually. According to the blurb, temporary files are going to be removed automatically but if you wanted to, you can clear them yourself… If that works as advertised then it’s nice that the option is or at least will be available for those that like to micro manage. It’s also nice to view the memory consumption of individual apps.