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Frequently Asked Questions (FAQs)

View the questions users most frequently ask about CCleaner. We recommend you read this before looking in other sections.

Product Setup

A full set of detailed documentation is available at You'll find how-to's, tips and tricks, and technical information for power users.

Community Forum

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Lost product license key?

If you have lost your CCleaner Professional license key or download link, use our license lookup tool to retrieve them.

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