Guide
Why Clean Your TV Does Not Work on Samsung, LG, or Roku TVs
Clean Your TV cannot work on Samsung, LG, or Roku TVs because those TVs do not run Android. Knowing that before you start saves a wasted setup and points you to the right tidy up instead.

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The Android Reason
Clean Your TV works by talking to an Android TV or Google TV over Wi-Fi, using network debugging on the TV. Samsung, LG, and Roku TVs run their own TV systems, not Android, so there is no Android side for the phone app to talk to. No phone app of this kind can clean those TVs, because the clean step needs the Android system it was built for.
That limit is stated on the Clean Your TV APK download guide up front, because a compatibility limit hidden at the bottom of a page wastes the most time. If your TV badge says Samsung, LG, or Roku, this app is not the tool, and no setting change on the phone will make it so.
How to Check Your TV
Check the TV settings menu for the system name. Android TV and Google TV sets say so in the settings and on the home screen, while Samsung, LG, and Roku sets name their own systems. If you bought the TV as an Android TV or a Google TV, you are in the right place. If the box or the settings name another system, stop and use the manual tidy up below.
When in doubt, check the official page requirements before you install anything. The Wi-Fi and debugging guide also helps here, because an Android TV that cannot be found is usually a network problem, while a non Android TV will never appear in the search at all.
Tidy Up Without the App
Without the app, tidy by hand in the TV settings: disable apps you do not use, rearrange the apps row, turn off recommendations you never open, and clear the cache of a misbehaving app. After a system update, repeat the check, because updates bring back apps a manual tidy had disabled.
The manual route is slower than Clean Your TV and has no restore point, so change one thing at a time and note what you changed. That habit replaces the safety net, and the keeps list guide is a good checklist for what to leave alone while you tidy by hand.
Compatibility in Short
Android TV and Google TV: yes. Samsung, LG, and Roku: no, because those TVs do not run Android. Check the system name first, and if the app cannot help, tidy by hand one change at a time.