Long time ago I was facing the ads on anywhere on my mobile like while using whatsapp and facebook watching videos on my galery etc. I check all my apps and didnot found any issue. I was confused and that time about what I did for anoying ads. Then I installed clean master and I cleaned my cache data and went to the antivirus option in this app. It showed that there was a system app called Provision which was creating malwares in my phone. Clean master adviced me to disable this app to safe my mobile. I did , I disabled that app and no ads showed after that process. Clean master really helpfull.
The another features of clean master which I like most its safe browsing option. Clean master in really a master.