I have been using Advanced System Care for my laptops and pc for quite a while, the tools and clean up options are excellent. I saw an add for Advanced system care for Android from Speed Up Slow Computer, Keep PC and Internet Secure, Freeware Download - IObit (recommended by MS) and loaded it into my Galaxy Ace. Excellent. I ran a scan and it found rubbish in there and cleaned it out and it also shows a little battery level indicator (numbers out of 100) on the home screen. Recommended. Oh, and its free.