Congrats on your soon to be hedgie!
If you do a search(located upper right corner) for bathing, aveeno oatmeal, flax oil, you'll come up with a lot of results about bathing...
For quilling babies, you use aveeno oatmeal wash, usually about once a week or so, and follow with a flax/vit e oil rinse. This helps sooth their ouchy skin while they are quilling.
As for adults, mine hasn't had a bath for a few months now. All I do is every week or so, he gets a foot bath to clean the poop off his feet, followed by an oil rinse.
So definitely check out the stickies on the forum, and try the search out. And if you have any more questions, feel free to ask! ^_^