I used the tool redis-commander to accomplish that.
npm install -g redis-commander
redis-commander --redis-port 6379 --redis-host 127.0.0.1 --redis-password YOUR_PASSWORD --redis-db 0
Then navigate to http://your_domain_or_ip.com:8081 and do what you need to do. You can also use redis-cli but if you're unfamiliar with Redis, like me, this is the way to go. Just don't delete anything right away. Make a backup first.
cp /var/lib/redis/dump.rdb /var/lib/redis/dump.rdb.backup
Further information about redis-commander: https://github.com/joeferner/redis-commander
