How do I clear stuck/stale Resque workers?

In your console:

queue_name = "process_numbers"
Resque.redis.del "queue:#{queue_name}"

Otherwise you can try to fake them as being done to remove them, with:

Resque::Worker.working.each {|w| w.done_working}

EDIT

A lot of people have been upvoting this answer and I feel that it's important that people try hagope's solution which unregisters workers off a queue, whereas the above code deletes queues. If you're happy to fake them, then cool.

None of these solutions worked for me, I would still see this in redis-web:

0 out of 10 Workers Working

Finally, this worked for me to clear all the workers:

Resque.workers.each {|w| w.unregister_worker}