If I'm doing it initially, I stick it all in a large container (say, a cooler) and use my sanitizer, which helps remove the label, making sure to get all the gummy gunk out of the bottle. I then put all the bottles onto a cookie tin and cover each mouth with a small piece of tin foil, securing the foil around the mouth entirely. Then, heat to 350 for 20 minutes and let them cool in the oven itself. When they cool to touch (and being careful not to disrupt the foil cover) I prefer to stick them into a 24-pack case so that I can close the top of that to try and limit the amount of dust that reaches the bottles at all. When I go to bottle, I simply open up that case and take off the foil covers--one at a time--and fill and cap each individually. Of course, taking the bottle out of the case (maybe in the six-pack holders) will allow someone else to help you and will take a bunch less time. Either way, I haven't had to re-clean bottles in a while and have had good success with this technique.