first try to remove bad link manually but its not possible to remove all manually then you have to use google disarrow tool

you can use google disavow link

Using webmaster tool ...

If you want to Remove the Bad Backlinks of website, Use Google webmaster Disavow tools.

If you want to Remove the Bad Backlinks of website, Use Google webmaster Disavow tools.

By Using Webmaster U can remove the links..

Disavow tool is used to remove badlinks

You may use webmaster to remove your links...

Contact the overseer of the sites that your site connected to then demand the evacuation of the connection. Deny instrument to expel those connections and it will require investment since Google will audit the demand.

If you find any bad back link of your website you can remove it by using Google disavow tool it is safe because Google provides this tool to the website owner to save the website from spamming. Or another way is available where you find the bad back links e-mail to that site request them to remove that link from the website.

you can use Google disavow to remove link

Go to Google Webmaster Tools and disavow the link. It won't actually remove the link, but it basically ignores that link from then on. Bing and Yahoo have similar tools.

You can use Google Disavow tool can be used to remove the link.

Use to webmaster tool to remove the backlink.