removing shellac from old oil paintings

What is the best way to remove dirty old surface shellac from old oil paintings in the case where shellac may have also been used as a pigment vehicle without also taking the actual painting off the canvas?
Re: removing shellac from old oil paintings rob howard   Posted at: 06/11/00 (4)
Re: removing shellac from old oil paintings barbara   Posted at: 06/11/00 (2)
Re: removing shellac from old oil paintings rob howard   Posted at: 06/11/00 (1)
Re: removing shellac from old oil paintings barbara   Posted at: 06/11/00 (0)
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