I am using Clean Master from the last one year on my samsung s3 mobile. This is great app that help to increase mobile speed and best part it is free of cost .The main function of the this app clean master is to clean the junk files of you android mobile to boost the mobile speed. You will be bored and frustrated if you have to open each app and clean junk files.
But from this app you are just one click away and all app’s cache will be removed. It also remove duplicate apps as well as files. If any app is frequently opening and causing the mobile cpu to overheat then you can stop that app and cool the cpu with the help of cpu cooler function of the clean master app. Clean master app speed up your phone but it doesn’t saves your battery life of your mobile phone.