IDG Contributor Network: How does Apple clean its refurbished products?

Apple’s refurbished products can often be great bargains, and they are one of the best kept “open secrets” of the company. But how exactly does Apple clean its refurbished products?The question came up in a recent thread in the Apple subreddit, and some redditors there had some informative answers:
WillPrlySugstClassix: “How does Apple get its refurbished products clean? Not even just refurbished; I had a repair done to my MacBook pro and they handed it to me in pristine