Short answer: the best alternative to manual phone cleanup is not "automation" by itself. It is a workflow that groups the right clutter together so you can review duplicates, screenshots, large videos, and repeated media faster without losing control.
That matters because manual cleanup usually fails from repetition, not complexity. The work becomes tedious long before it becomes technically difficult. A good alternative reduces the amount of context-switching you have to do by hand.
What a good alternative should improve
It should surface the biggest safe cleanup wins earlier.
It should group related items so you stop rebuilding context every few seconds.
It should preserve review quality instead of trading accuracy for speed.
It should make broad storage cleanup feel finishable instead of endless.
When manual cleanup is still fine
Manual cleanup is still fine when the clutter is tiny, obvious, and limited to one category. The best alternative matters only once the cost of doing it all by hand starts exceeding the cost of choosing a better workflow.
What usually beats manual scrolling
Grouped review is what usually beats manual scrolling. That applies to duplicate photos, similar shots, screenshots, heavy videos, and mixed storage clutter where the phone is full for several reasons at once.
If you want the comparison route next, open best phone cleaner apps. If you want the direct tradeoff, continue to Cleanor vs Manual Cleanup.
The best alternative to manual cleanup is the workflow that removes repetition first, not the one that just adds more buttons.