A new client is asking me to improve his website's ranking. he says his former SEO expert is claiming that because his site was defaced a few times for long periods its almost impossible for him to improve the site's ranking.
How much effect does multiple site defacing have on SEO. what can be done to see what the damage is in retrospect? Are there any tools that can quantify or indicate such damage? And is there anything I can do to undo such damage?