RabbitMQ version: 3.8.2 Erlang 22.2

Due to some issues, I had to reinstall RabbitMQ and Erlang on the server. 

Despite reinstalling the applications, the queues from the previous instance still exist as well as new queues are being created(queue names given by Guid's, hence unique).

Is this normal behaviour?
How do I delete the older queues which have no consumers attached to them? I have ended up with 25,000 queues this way :|

Thank you