Issues with a rode hard wordpress site and duplicate files

Hi.

I've got a site thats pretty big and a bunch of the files are in there 2 and 3 times and its annoying and hard to look at this mess.

Is there a way to weed out ones I don't need.

For example.

about-2
about-3
about-5

contactus-72
contactus-73

so what if I could say, alright you horrible thing. I just want to know which ones of you are the latest ones and working on the site and the rest of you can burn. Viola!, the flowers are still standing.

Any quick way to pull that off? Is that something a mortal man like myself would struggle with but someone with the know could be hired for such a thing?

Thanks,

John