On Fri, 28 Mar 2014 07:44:51 -0700, "Pico Rico"
wrote:

when you need to unsolder a pipe connection and then resolder to it, are
there any tricks to the unsoldering, or to clean the joint of solder so you
can put a new coupling on it to resolder?


drain all the water first, heat and dissassemble, wipe the heated end
to remove all excess solder, leaving the pipe nicely tinned.
Drilling the coupling you are removing helps drain the pipe.