Uninstalling Clean Master or any similar app saves up to 25% of battery life.
We tested this on a Samsung Galaxy S6, running on Android 6.0.1:
After 1 day, the battery was at 77% with Clean Master uninstalled!
You can still delete cached data on your Android smartphone, without any ad serving, bloatware app:
- Go to Settings > Storage
- Click on Cached Data:
- Press Delete:
- This will clear all cached App data:
As for the 'Memory Boost' function, you don't need to worry about that. Android frees memory as needed, by closing unused, low priority background apps.