If you choose to take a shower right after your arrival, that means you will be stuck in the airport for 12 hours, as you will have had cleared the security checkpoint, and you can't "Get out".
My suggestion if you'd like, is that you refer to old threads about short excursion to Hong Kong (sorry I can't hyperlink), where many people have had similar experiences as you have. After your short trip, take a shower AFTER you come back to the airport.
Well, that's just me. I thought I give you a different idea
[This message has been edited by fakecd (edited 01-27-2002).]