A "sponsor" application ad keep appearing on my phone

[Android Central Question]

It keeps popping up on my screen and I tried using zemana and clean master to remove it. Alas, they too couldnt remove the virus. I need help

 

[ManiacJoe]

Depending on the maker of "Clean Master", this app may be the one showing you the ad in the first place.

While the ad is being shown, tap the "previously used" button on the navigation bar and see if it tells you which app the ad is.

 

[crackhead007]

Clean master is known to load ads on your phone.

 

[Prabhanjan Shiralkar]

Same problem but still no solution..please help