How to delete cookies for a specific site
- Click the document icon next to the URL.
- Click the "... from this site" link under the Cookies section.
- Highlight the cookie and choose Remove. You can also Block the whole site.
You can do it through Chrome settings. Just go to Preferences -> Options -> Under the Hood -> Content settings -> All cookies and site data...
There you can filter single domain from the list and delete the ones you like.
The bookmarklet from http://ostermiller.org/bookmarklets/cookies.html should work without modification. Just visit the target website first
javascript:void((function(){var%20a,b,c,e,f;f=0;a=document.cookie.split(";%20");for(e=0;e<a.length&&a[e];e++){f++;for(b="."+location.host;b;b=b.replace(/^(?:%5C.|[^%5C.]+)/,"")){for(c=location.pathname;c;c=c.replace(/.$/,"")){document.cookie=(a[e]+";%20domain="+b+";%20path="+c+";%20expires="+new%20Date((new%20Date()).getTime()-1e11).toGMTString());}}}alert("Expired%20"+f+"%20cookies");})())