Share your experience!
Yes, u can use "Power Clean".. Its small but very aggressive to clean junks.. Hope it could be helpful 
https://play.google.com/store/apps/details?id=com.lionmobi.powerclean&hl=en
Usually these kind of apps monitoring your device all time for Memory,CPU and Temperature.. So its running all time and consume some amount of memory..
This application use your memory upto 25 MB..
Try Ccleaner. Very good and dont stay on backround.