If there is no any access of admin. Without login at admin side we can clear che cache.
Now, here we are describing the command:

Enable the cache use this:

php bin/magento cache:enable

Disable the cache use this:

php bin/magento cache:disable

Flush the cache use this:

php bin/magento cache:flush

Clean the cache in the site:

php bin/magento cache:clean

 

Execute the above command using command line and be happy. :)