I hang out with a group of seven people
And one of these people has lied to us in the past, and we've made it very clear that we don't want to associate with him
I really do try to see the best in people, but it's just so hard with him
He has no table manners, obviously doesn't take care of himself, and I'm really starting to think that we should tell him to go away again because it didn't work the first time
And yeah, I should've just gone to Yahoo! Answers, but this is a very strong community
What should I do?

Yeah some people you just don't want to be around and that's fine, you're not gonna be friends with everyone but you can try to respect every and I appreciate you're trying. I think the best thing to do, if he really isn't being a decent person is just to tell him bluntly (not in a rude way) just bluntly that it may be best if he hangs out with another group. It's difficult if he doesn't have any other friends though. If you don't want to be direct then try to make sure everyone in your group has the same agenda and just distance yourself from him until he gets the point.

Thats actually very helpful
Thank you

No worries, I hope at least one of those strategies work

I know it isn't this person's first time doing this. But would it do anything to just point it out to them bluntly. If you point out certain things to someone about themselves, they can become more conscious of it and change it.