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I don't know how to get rid of themThere are several ways of blocking an ad so it will not display on your pages:
Use the Ad Review Center of your Adsense account to proactively authorize each ad,
In the sense you can approve or block ads *before* you see them on your page. Some haven't got that far. I do agree that the ads go to your page whether you approve them or not and if you are not diligent with the review process, you may never see them but they are appearing for some users.
There is nothing proactive about the Ad-Review center
There are many ads I do not want on my pages that make it through the ad-balancer because they bid high.