bruteforce method - remove and replace /etc/nginx-cache Tool (untested) - https://github.com/perusio/nginx-cache-purge

Acquia varnish cannot cache files >10MB as per https://docs.acquia.com/acquia-cloud/performance/varnish/files/ To find for those >10MB files, search from the sites/default/files: 1find ./ -type f -size +10M -exec du -sh '{}' \; -print|grep -v ^\./| sort -n

From drupal admin UI: Administration > Configuration > Development > Performance But will work only if you have drupal admin login. Otherwise, you need to install drush instead and do the 'drush cc all' from there. Some other options -> …