Solder char/soot - how do you clean it off?

[Yorg]

I hope I'm not repeating a question, but the search didn't turn anything up for me.

I have just about finished my new setup - a HERMS.
I've done a fair amount of silver soldering of copper- but I've noticed some joins have a nasty black soot on the inside of the pipe.
I'm tipping it might not taste so good.
How do I get this stuff off without replacing it with something even more unpleasant?

 

[user 4295]

I would use some kind of solvent, followed by a soak in PBW or Oxyclean or something like that, and then a good rinse. When I do any brazing or silver soldering on refrigerant systems I always have a nitrogen purge going through the lines to avoid having that happen. No oxygen, no soot.

 

[iBeer]

I've never had to clean the inside of my solder joints, but I have cleaned the outside very successfully using a stainless steel cleaning powder. You might want to try that with a pipe cleaning type of snake...
Good luck!

 

[thebikingengineer]

Water and a snake brush (try a tuba brush from a music store) should get it right out. Maybe some detergent, but nothing more powerful should be needed.

 

[Monster Mash]

White vinager and water works wonders for polishing up copper. Star San works well too.

 

[Yorg]

Thanks folks.
However, what is StarSan - I don't think we have that product name here in Oz?