[ceph-users] Help needed with Grafana password

I configured a password for Grafana because I want to use Loki. I used the spec parameter initial_admin_password and this works fine for a staging environment, where I never tried to used Grafana with a password for Loki. Using the username admin with the configured password gives a credentials error on environment where I tried to use Grafana with Loki in the past (with 17.2.6 of Ceph/cephadm). I changed the password in the past within Grafana, but how can I overwrite this now? Or is there a way to cleanup all Grafana files? Best regards, Sake