If you've made some changes to your page in the editor, simply save the page. Saving the page ensures the next time an anonymous viewer navigates to a page, it is re-cached and does not contain any old content. If you've made any changes outside of editing your content (such as changing a classification), simply append the URL of the page you would like to be re-cached with
?nocache as in the following example:
The no-cache parameter can only be triggered by users who have Edit permission on the page.