Well, as you have been told over and over by several members the solution to your problem is simple.
Clear your browser cache
Enable Cookies
Login and check remember me next time
If it doesn't work, reinstall your browser and go to this link below;
[Hidden Content] or [Hidden Content]
Login and Tick Remember Me, Voila Problem Solved
If you have already used CCleaner then I have no idea where your problem is coming from.
It could be that its coming from another site or an app you installed on your device.
I can't say this enough, if you're logged in to the site, you won't see ads.