You want to remove your URL from google's cache.
One can change the page hosted by themselves & get it offline from internet, but we all know by now.
Google is very intelligent & keeps a tab of your online activities
So if you really want to remove a URL from google's cache, this URL can help you
Although you'll have to give proper reasons & convince them, & they will take some 3-4 days to do the same, but still you can try & get results.
Hope this will help a lot of people around