does ccleaner free edition

CCleaner for Windows
1

clean the "C" drive only or does it clean all drives including removable drives and USB flash drives?

And if yes, do I need to active it in the program somewhere?

I know I need to check off the different drives if I want to wipe free space.

Thanks

2

http://www.piriform.com/docs/ccleaner/using-ccleaner/including-files-and-folders-for-cleaning

that link explains how to get CC to clean more than the current logged on user stuff.