@dandelion
If you can get ahold of it, use cleaning grade freon (ie: non-lubricated tuner cleaner). Completely non-conductive, and unlike WD-40, non-flammable.
The battery redrumloa has is perfect for the job. Professional looking, NiMH so it won't leak like NiCD.
As for soldering, what you have is perfect. Just heat up the pin, wet it with a little solder, then suck it out with the vaccum tool. It should suck clean.