do the piping yourself should be easy if it keeps popping off i found a couple of posts about what to use to clean it up
do the 50/50 mix and block up the end shake around a bit empty, repeat till clean. Then let it dry before putting it back on. Also go buy some decent clamps if they keep coming off.
http://www.skylinesaustralia.com/forums/in...showtopic=69501
http://www.skylinesaustralia.com/forums/in...=135634&hl=
http://www.skylinesaustralia.com/forums/in...=134057&hl=
Servicing anyone should be able to help you out maybe autotech, or trojen if you want to be particular...