Dissolving heavy greenishwhite internal corrosion on brass plumbing

[Horace Algier]

I need to clean a bunch of brass plumbing fixtures' internal bores of the greenish white (mostly green) corrosion.

There are passageways I can't get sandpaper and wire brushes into.

What solution would you use?

Googling I discount the lemon juice and baking soda ideas as too weak (fine for jewelry though).

I think they're copper sulfates or maybe copper oxides or maybe even copper carbonates, each of which may react differently to acids and ammonia.

Looking for industrial strength solutions I see people advise vinegar (which seems to weak to me) or maybe even muriatic acid (which seems too strong), or maybe even ammonia.

Which do you use?

[Horace Algier]

I took three brass fixtures heavy with the greenish white corrosion and dumped them in three different solutions with three different instantaneous results...

1. The household vinegar has been acting for about a half hour, and all I see happening is that the green corrosion is turning slightly blackish, so I can't tell if it's working yet.
2. The household ammonia has been acting for the same time, where the ammonia is turning blue, so I guess it's working.
3. The muriatic acid bubbled instantly a bright frothy yellow color, so "something" happened really quickly. I only let it sit for ten or twenty seconds, as the reaction was far too great for me to control before I rinsed it off with the hose.

Do these different chemical reactions to the same stuff tell the chemists out there anything about whether I have a copper chloride, a copper sulfate, or a copper oxide that I am trying to get rid of?

[dadiOH]

You don't have to use it full strength (which is usually arounf 28%). If you do dilute it, add the acid to water, never vice versa.

[Jack G.]

I have used a good brand of hot sauce with good results.