The Custom Clean function within CCleaner allows you to customize how the app cleans different parts of your computer.
To use the Custom Clean feature in CCleaner, follow the steps below:
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Launch CCleaner 7 on your Windows device.
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On the CCleaner product, click Custom Clean on the top-left corner of the screen.
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In the Custom Clean window, you have Junk, Browser, and Registry tabs.
Note: The Junk tab includes an AI tools option that allows you to find, analyse and clean AI chat/agent history, caches and locally stored models for these apps.The AI tools covers applications such as ChatGPT, Claude, Cursor, Codex and Gemini.

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Select the checkboxes in either tab that are most relevant to your needs and click Clean and fix. Custom Clean scans your computer for the types of data you have chosen.
If you see the Your registry will be saved automatically prompt on the screen, click Continue.
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After the scan is complete, click Clean to clean this data from your computer.
Restore registry backups
To restore registry backups, follow the steps below:
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Open Windows File Explorer and navigate to the following location:
C:\Program Files\Piriform\CCleaner 7\data\RegistryBackup
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Identify the Registry backup file. The name of the file will be cc_date_time.reg by default.
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Right-click the file and click Merge.
Your computer will attempt to restore the registry backup.