How to purge nginx cache ?

1. First find your Nginx cache path.
2. In our case Nginx cache path was defined in nginx.conf site-enabled file located on /etc/nginx/sites-enabled with proxy_cache_path directory to be /var/cache/nginx/tileserver
3. Remove the cache folder by executing the following command : rm -rf /var/cache/nginx/tileserver
4. Restart Nginx to reenable caching : sudo systemctl restart nginx