PCManFM won't clean usb devices

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Hello,

I have a USB stick connected and when I delete a file from it in PCManFM, it does not free up the space used by the file, even upon unmount. This means that in order to free up space on the device I have to reformat - very inconvenient and not practical for a large storage device.

I used to use thunar and when unmounting a usb device it would ask wether or not to 'clean up files'. Then it would free up the space.

Please tell me how I can fix this, this is a very important and basic function for a file manager. I am currently using Lubuntu 10.10 fully updated. If you would like any more information i.e content of config files please let me know

Thank you!

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I have successfully identified the problem. It was located between the chair and the keyboard.
I neglected to empty the trash, which successfully freed the space. whoops!