Carb rebuild

["Olenick, Jamison" <Olenick@ssims.nci.nih.gov>]

Can anyone tell me the best way to remove the hard crusty white residue from
the insides of an old carb?

I am in the process of rebuilding it but I am having difficulty getting all
of the hard white residue out.  Is there anything that will dissolve it but
not hurt the metal?

Thanks in advance.
Jamie