There are direct buses from HK Airport to the Dongguan area.
Check out these links from the HK Airport website.
http://www.hongkongairport.com/CBT/Controller?locale=eng
http://www.hongkongairport.com/C ... =23&schemin2=59
As you can see, there are plenty of bus choices of various prices for various places. The last bus to Dongguan leaves at 22:30 hrs. If you know exactly where you are going in Dongguan prefecture, you can find the city and times listed.
Once you pass all proceedings into the airport arrival area, ask information and they will direct you to the bus gates and ticket counters. These are all within the airport complex.
Remember to write a report of your adventures in Dongguan.
edited: added additional info
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Last edited by doghead at 23-11-2010 22:14 ]