Adware on Samsung Galaxy Phone

My wife's phone keeps getting these pop ads for "Ad blockers" on her phone. They pop out of nowhere, like it's running in the background. I think her phone is infected. These ads want you to click on their ads to get software that will block ads, which is ironic. Does anyone know how to remove them? Or what should we look for?

See if this will help: How do I get rid of Pop-up Ads on my Samsung Phone? | Samsung Australia

Thanks. But my wife was able to fix it. Apparently it was some setting in the Google Play store that was causing it.