CCleaner has many abilities, but it can't do everything. Here's a list of what it can and can't do.
CCleaner can:
Protect your Web browsing privacy on a shared or public computer by deleting passwords and other temporary Internet files, so that nobody will be able to see where you've been. CCleaner Professional can also delete browser tracks every time you close your Internet browser – automatically or on demand.
Protect your privacy for many Windows applications by removing information about files and folders you've accessed using them.
Remove traces of documents you've already deleted by securely wiping free disk space.
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