Here is an easy way to clear your temporary files under Windows Phone 8:
Swipe left to right on the Start screen and go to Settings.
Go to the "storage check" section.
Swipe to the "details" section.
Simply tap on the "clear" button to erase temporary files:
Windows Phone 8.1 comes with a new feature called the Storage Sense. It allows you to manage and optimize the use of your phone's internal storage and SD card.
Open Storage Sense.
Tap on Phone
Tap on Temporary files
Tap on the delete button
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