For solder, the best is quadutectic solder from Cardas. It makes the best airtight join.
4 responses Add your response
Agree with TImo, and would like to add that TRT Wonder Solder is great sounding solder too.
Either plated or un-plated Cardas should perform better than the original posts. I prefer un-plated and have installed them on every piece of equipment I own.
As to your question about removing flux. Radio Shack has a spray that is very effective and likely available near your home. I suggest you spray on to a Q-Tip swab after the work is cool, carefully cleaning until the residue is removed. Good luck with your project.