Seriously it do nothing just show you that it have cleaned the ram and internal cache memory but nothing such happen. It is just a virtual fool. If you do not agree to me just download file explorer and check out the cache folder. Count number of folder in cache and then run Clean Master. you will still see those files in cache memory whereas the app will show that cache is empty.
Even to run the clean master you required a lot of internal memory. Sometime my phone get switched off when I run Clean Master.
I prefer no to this app. I would recommend do the deletion of file and cache and temp memory manually.