How to delete all files

I want to delete all pdf files on my phone to release room,but deleting them one by one seems the only way to me.so please help
my operating system is WP 8,and the version of
adobe reader is 10.1 build 76837.

[topic moved to Windows Phone subforum]

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    time machine:   how to empty and delete all files?

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    Scott

    Hi Scott,
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  • How to delete all files and folders (with files) in IsolatedStorage.

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    Click
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  • How to delete all ALERTS in iCal at once?

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