Given the choices of no extraction, hot water bath or using my oven, I would choose the oven. I say this after facing these options for a couple of years. When the opportunity presented itself, I purchased a two ball rejuvenator oven. The rejuvenator oven makes the job easy, but if I did not have one, I would not hesitate to use my oven, making sure to keep the temperature around 125 and wiping the ball regularly.