Why does the CCleaner Tray Icon come back after restarting my PC?

In CCleaner v5.46 and onwards, the CCleaner Tray Icon is shown in the Windows Notifications Area if the Smart Cleaning process is running. To stop this, switch off Smart Cleaning by unticking the checkboxes in the Smart Cleaning menu.

If you are running a previous version of CCleaner, please update to the latest version for the latest cleaning definitions and follow the instructions above.