cleaning dulled marble

I have moved into a house that has beautiful amber colored marble in the master bathroom steam shower. Problem is that it is covered in a white film of scum of some kind and no matter how hard I scrub or what I use it I cannot restore the marble to the level of the rest of the bathroom. Any help greatly appreciated - thanks

 

Dulling of the marble surface may be due to improper maintenance and cleaning products. Clean, seal, and maintain with products recommended for natural stone products. Your usual bathroom cleaners are not safe on marble. Check with your local hardware or home center or online for marble and natural stone products.

Marble can be cleaned, polished, and kept sealed and cleaned with the proper products. Marble is a soft limestone and can be easily etched and dulled by products containing acids. Many bathroom cleaners contain acids in their formulas, as do some soaps and shampoos. Marble is beautiful but is not an ideal product for the shower because of the constant exposure to soaps, shampoos, and the use of improper cleaners by those not familiar with the nature of marble.

Marble showers should be wiped dry after each use to prevent hard water minerals from etching surface. It should be sealed with marble sealer about every six months and cleaned with recommended pH neutral cleaner and polished each week with marble polish. There are pH neutral disinfectant sprays available that are safe if mildew is a problem.