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Thanks for the additional advice.

Thanks Donnie, I really appreciate your response

Okay thanks for the response

Yeah, massive drop-down of traffic. By the way thanks for the suggestion, really appreciate it

Thanks for the response. How about just continue building good quality links and forget the bad links, do you think it will help?

Do you think creating some new link (quality links) will help out?

I just want to ask your advice or suggestions, my new client site received a link warning from Google regarding unnatural link, as I've checked his site backlinks using Seomoz site explorer there are almost 4000+ backlinks and almost 3/4 of the total links are from forum profile spam and blog comment spam. I know it is impossible to remove all those links totally. I would like to ask your advice if what's the best thing to do? Setting up a brand new site and domain or doing a cleanup. Thanks in advance.