Android is a multitask system, so task can be run in background ,but it wastes our phone's limited memory and battery.
This is what Task Cleaner do . it will release memory , saving battery and make our phone fast!
How to use?
Click to end some Third part running task,
or long press to add to Auto-kill list. when phone is screen off / sleep mode will be killed.and you can select auto-kill interval to kill by interval mode.