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Galvanizing is a process of dipping a metal product into molten zinc.
Galvanizing is used as a economical method of protecting steel from rusting,
therefore increasing the durability of a product.
The wire used for aviaries and large breeder cages is generally galvanized wire.
Galvanized materials are left with a powdery film (of zinc) which needs to be removed
if the item is to be painted.
A mild acid, such as vinegar can be used to remove the powder without
harming the protective layer of zinc.
Although washing will remove the loose zinc powder from the finish,
don't be fooled into thinking that it changes the zinc plating that remains.
Vinegar is an acid, it could remove the zinc eventually but it will not neutralize it.

How this applies to bird owners:

#1 cage wire, used for breeder cages, aviaries, etc, is galvanize wire.
Washing with vinegar will not remove the zinc, only the powder.
Birds are still exposed to the zinc, in no way is it neutralized.  
If you were to remove the zinc by soaking or sandblasting, the wire will rust very quickly.
You would need to apply another finish to the wire, such as paint.

#2 Most common hardware (nuts, bolts, chain, washers, quick links) are either galvanized or zinc plated.
Galvanized products are dull, plated products are shinny.
The same issues apply to these as the wire above. Washing will not, does not, neutralize the zinc.

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C.Polega / Design-Rite 2002