Old stains in marble

Hello all,We were asked to strip an old marble statue (which had been painted some decades ago and that had several coats of different types of paint on it). We finally got to the marble, just to find some dark and yellow stains imbeded in the stone. They don't seem to come out with commercial compresses and after washing.Our next step is trying to bleach them so they don't look so dark. Does anyone have any suggestions or experience with this type of problem? Thanks a lot!findstone2009-10-22 13:08:58