In my opinion, please never use clean master. It says that it remove unwanted cache files but in reality it do nothing, if you have any doubt on this, go and check your file Explorer, there you can see those so called "deleted files by clean master" still exists . so in reality nothing happens.
Moreover it requires more internal memory for storage. It is like alloting space for a unwanted and useless piece. Also my some data got lost after using clean master. So please take care and think before you click "clean" option.