How do I clean registry in windows 11 after uninstalling apps?

Windows built-in Disk Cleanup tool doesn’t have an explicit registry cleanup feature, but you can use the Cleanmgr command along with certain parameters to remove unnecessary system files, which can indirectly help clear some registry bloat.

Steps to clear registry for Windows 11:

1. Open Command Prompt as Administrator.
2. Type cleanmgr /sageset:99 and press Enter.
3. Choose the options you want to clean up (including system files) and click OK.
4. Then type cleanmgr /sagerun:99 to run the cleanup.

Instead of manually cleaning up the registry, you can use System Restore to roll back to a previous state where the registry might have been in a cleaner state. This can be useful to clean Windows 11 registry if the registry has accumulated a lot of unwanted changes over time due to software installation or uninstallation. 

1. Open the Start menu, type "Create a restore point," and select it.
2. Under the System Protection tab, click System Restore.
3. Choose a restore point from before the registry became cluttered and follow the prompts to restore your system.