lnjr

I was wondering if I can use ccleaner to wipe the free space on an external hard drive. I went to the setting section and selected the external hard drive that I wanted to wipe and removed the check mark from the hard drive that is on my pc but when I started cleaner it is doing drive c instead of the external hard drive. Am I doing something incorrectly or won't ccleaner wipe the hard drive space on an external hard drive. Thanks so Very Much