There are a few ways to remove them. All are the same principle.
When you look at "Who's Viewed Me", you get a series of profiles. The top right corner of each, I believe, has a small circle with an 'x' in it. You just click on the 'x' and it says, "Don't show this person again". It doesn't mean they can't contact you, it just means it won't show up if they view you again down the road. It also won't show up in your searches.
Then, if you do a search, you get pages of profiles. Again, each has a small circle at the top right corner. Click it, and the same thing happens.
Third, if you are looking at one specific profile, and then decide you are not interested, on the right side of the page there are a few options, I think in blue. One says "Block this person from searches", one says "Block this person from contact". Those are self-explanatory...
Finally, you can go under your account, there is a section called "Blocks". If the person has bothered you and you don't want them to contact you, in addition to you not viewing them, you put a block on them. I only did that to a few who sent me rather suggestive messages.
Oh, and if you accidentally block/hide the wrong person, just go back into your account and you can 'unblock' them. Jeff, know you know what I am doing when I am up until 1 a.m.!
Pretty much any guy who is topless and/or flexing for the camera in his profile pic gets removed by me...
