“By removing the bad links directly, you’re helping to prevent Google (and other search engines) from taking action again in the future,” Jonathan Simon, a Google Webmaster trends analyst, wrote in a company blog post. “You’re also helping to protect your site’s image, since people will no longer find spammy links pointing to your site on the web and jump to conclusions about your website or business.”
When all avenues to manually removing the problematic links have been exhausted, Google suggests giving the “disavow links” tool a shot. Webmasters using the tool will be asked to select their site and then upload a text file containing the offending link. Google takes care of the rest.