leaving the ball outdoors in the sun probably won't hurt it but I'm not sure how effective it really is in de-oiling a ball. There is nothing to remove the oil from the ball so at most you are removing a very small amount of oil probably most of what comes out is reabsorbed. Set one out one day then wipe it off and set it out the next day you still have a wet ball the next day and even on day 4 the balls still wet. I don't know how true it is but I've heard that a lot of what you see on the ball from this method is actually condensation from the temperature variance between the outdoor heat the ball and the core of the ball and not actually oil. I don't know how factual that is but makes some sense and explains why you never get a clean ball with this method.
Anytime you do actual oil extraction soak method or any of the other ways to de-oil you should resurface the ball afterwards for best results.
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