Cleaning the site after hacking

There is a site that was hacked by detractors and then on the main page and several more noticed open links. I managed to remove the links myself from the main one, but it does not work from other pages. The task is to remove these links from the specified pages and check the entire site for other third-party codes and "hole" and fix them. Site on Joomla 2.5. We need to do it very, very urgently!