Please find below to clrear cache in Drupal.

1. The easiest way to clear the Drupal cache is to go to Administration > Configuration > Development > Performance
(http://example.com/admin/config/development/performance)
2. Click the button “Clear all caches”

The most convenient way to rebuild Drupal’s cache is by using Drush.

Drupal 8:
drush cache-rebuild

Drupal 7 and earlier:
drush cache-clear all