I'm using YSlow to troubleshoot a slow-loading Wordpress site, and it's showing that several .js files associated with plugins that I have uninstalled/deleted (in some cases uninstalled several days ago) are still loading -- or trying to load. The plugin files are no longer on the server. If I try to click through to the filepath that YSlow lists as the .js path, I get a 404 error (the .js files are no longer there).
Why would YSlow still see paths to these scripts in the header if they no longer exist? I have deleted cache for WP Super Cache and cleared the browser cache.
Any ideas?