Titanium,
I also just purchased the same heatercore, and I'm trying to do the same thing you are doing. So far I have found the following web pages:
http://www.overclockers.com/tips250/
http://www.phlux.co.uk/articles.php?aid=7&page=1
http://www.overclockers.com/tips1022/
They mention cleaning briefly. The part that I'm a bit confused on what to do about, is cutting off the pipe and getting it to work with my 1/2 OD, 3/8 ID vinyl tubing. I can't seem to find any couplings or barbs that will fit onto the end of the inlet/outlets, to be soldered. If I find out anything else, I will PM you.
Good luck