free space wipe usb storage android

I have a samsung galaxy s2. I can mount the phone as usb storage. both the internal and external microsd cards show up.

Can I use ccleaner on my xpsp3 laptop to wipe free space on my phone. Seems like a good thing to do.

thanks in advance!

Hold off doing anything via your phone plugged into Windows, and rejoice after reading this announcement:

http://forum.piriform.com/index.php?showtopic=38155