My wife accidentally cleaned the dirty grout of our bathroom floor with Ajax which has lactic acid and phosphoric acid... all the bad things for marble. We have marble/ceremic tile veneer(?). There is now loss of the top coating on the marble and it has gone rough and has a permanent whitish stain on it (photo attached). Does anyone know how I can fix this? Can I put sealer back on it? Are there professionals that specialise in this type of repair job? Is this fixable?? Thanks everyone. This is our PPOR.