[android-developers] Clean other apps cache

There are some apps out there which claim to clean cache from all
apps.

How does it work?
Assuming it's not rooted, Isn't the data of one app not visible to any
other app?

Some links I found:
http://groups.google.com/group/android-developers/browse_thread/thread/7eac32e84ac65758/823efd5581f8365b?lnk=gst&q=listFiles#823efd5581f8365b

Thanks

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