Clean Master helps you to clean cache and residual files from your device. It also cleans app packages and history information which are kept by several applications.
It has very simple window that you can select 4 options. If you select History, you can erase history files such as browser, facebook… If you select Residual Files, you see the residual files in your device like image tumbnails. When you select Temp APKs you are able to select and erase them. Final option is Tasks. In the tasks section you can see running tasks in the RAM, so yo can stop unnecessary ones in order to increase the battery life.
In a word, Clean Master is one of the must tool you should have in your android device. It makes simple to clean RAM and residual files.