Phone Clean…..
Not an App, a utility that gets rid of all the things that slow up your Apple device.
PhoneClean is uniquely designed to reclaim more free space on iPhone, iPad, iPod touch and make all iOS devices running faster. Working on both PC and Mac, this free-yet-magic tool will safely remove all kinds of useless files on iOS system in order to clean up and speed up your iDevices.
http://www.imobie.com/phoneclean/
The first time I used it it found an extra 1.2 Gigabytes of space on my iPod Touch and an
amazing 2.79 Gigabits of space on my 16 GB iPad.
The cynics among might ask if this is possible why do Apple not include such a facility or are they
happy for you to think that your device is full and you need to buy a bigger one.
"Even if you are not paranoid, it does not mean they are not out to get you!".