Northern Fowl mites don't live long off the bird.right, so if I am going to quarantine him how will I keep the mites (or whatever they are) from infesting the garage, or even me?
Your other birds are infested too. You can return him to the flock since you need to treat them all and the building while you replace all the bedding.
In response to your first post about apple cider vinegar. It has some good qualities like acidifying the system, adding enzymes to the digestive tract and keeping waterers from getting slimy. BUT, it won't treat external or internal parasites.