I have a client`s site which have all duplicate content, each article, is duplicate, he copy-pasted each article from other sites, even the pictures names, title and alt, even the page title etc.
The client told me that I can delete everything.
But what can I do? Because he has 2500 pages indexed, including duplicate tags, categories etc. ...
I can remove only one by one in google webmaster tools, but will take a week just to remove all of them..
and if I let all 404 indexed after I delete them is bad for seo.
Redirect all of them to homepage is bad for seo..
What should I do?