Cleaning Flash cookies in CCleaner for Mac

Note: this article is relevant to version 1.18.30 of CCleaner for Mac and below.
You can also find helpful information about the latest version of our macOS app.


A Flash cookie (also known as a Local Share Object, or LSO) is a collection of cookie-like data that a Web site running Adobe Flash can place on your hard drive. Like regular cookies, Flash cookies contain information about when you visited the site, and may contain tracking and settings information.

Flash cookies are stealthier than regular cookies. Flash can install cookies on your computer without your permission by default. You can change the default setting for Flash cookies at this Macromedia Web site page ("Allow third-party Flash content to store data on your computer.").

Or, you can use CCleaner for Mac to clean Flash cookies when it runs. By default, CCleaner is set to leave Flash cookies alone.

To set CCleaner for Mac to clean Adobe Flash Cookies:

  1. In the left pane of CCleaner for Mac, click Cleaner, and then select the Applications tab
  2. Under Applications, ensure that the check box for Adobe Flash Player is selected

Note: Remember that cookies and Flash cookies are two separate things. Simply clearing the Adobe Flash Player setting will not set CCleaner for Mac to clean regular browser cookies

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