The brown residue is of course the flux.
Different brands of solder have different amounts of flux in them. I had to return an entire roll of "economy" solder because it left a massive amount of flux mess all over my work. The Kester will be much cleaner and solve most of the problem.
For cleaning, I like to dip a toothbrush into a capfull of alcohol. The bristles do a good job of getting between pins. Dry with a paper towel.
Different brands of solder have different amounts of flux in them. I had to return an entire roll of "economy" solder because it left a massive amount of flux mess all over my work. The Kester will be much cleaner and solve most of the problem.
For cleaning, I like to dip a toothbrush into a capfull of alcohol. The bristles do a good job of getting between pins. Dry with a paper towel.




