On 2 Mar 2005 06:33:56 -0800, "Tim Shoppa"
wrote:

[Vinegar] Up here in Canada, the
most common is 5%
although I suppose if a fella looked hard enough,
he could find higher concentrations.

At higher concentrations of the active ingredient it'll be called
"acetic acid". At high enough concentrations, "glacial acetic acid".

But doing higher concentrations won't help much in getting rid of rust.
Go straight for muriatic acid.

Tim.
Personally I use Citric Acid, available from your local drug store or
homebrew outfit.
AND you can legally pour it down the drains afterwards without the
local municipality breathing down your neck.
Mike in BC