Fast Cleaner
Only 2 MB, Fast Cleaner can clean cache, junk files to reclaim storage; stop unnecessary apps in background to clean RAM and speed up your Android phone; and stop apps from auto-start to save battery power.
Make sure you open the app after installing

You must keep the app installed for at least 7 days!

You must open and use the app on 3 separate days to get credit!

If you uninstall mCent, you will NOT get credit