Unfortunately rust stains are the most difficult of stains to remove from marble.
Remove grout from marble.
If it is actually a cement haze then if you take some diluted vinegar in a out of the way spot and apply it to the haze it should remove it.
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Make sure the water is warm as this will help the cleaning.
Rust stains can usually be removed with a poultice or a non acidic rust remover.
This poultice will have 6 percent hydrogen peroxide.
Fill a bucket halfway with warm water using about a gallon of water.
It is not that hard to repair grout once you un.
Be careful if you are removing a stain from darker colored marble as hydrogen peroxide can cause the marble to lighten.
It won t harm your carrara marble at all.
Stir in four spoonfuls of liquid dish detergent or about four squirts from the bottle.
Move to chemical grout remover if the sponge and water don t work.
2 put on a pair of rubber gloves and apply the cleaning solution to the marble shower with a sponge or.
Read the directions carefully as different.
This can kick up a lot of grout dust so make sure the area is well ventilated.
The key is to use a mild.
Fill a sponge with water wring most of it out and pat the surface of.
Most grout haze removers are acidic and will etch the marble dulling the surface and ruining the finish.
Mix 1 2 cup hydrogen peroxide or chlorine bleach with 1 gallon of warm water in a bucket.
As you work be very careful to avoid the edges of the tiles themselves as you do not want to chip or scratch them.
Using a grout saw or an electric tool such as a dremel with an appropriate attachment begin to remove the grout from between the marble tiles.
However you can use the hard water and soap film remover which works very well to remove grout haze and is made for use on marble and all stone.
Dampen the grout haze with pure water first to see if that removes it.
Note that you should not be using a standard grout haze remover on carrara marble or any marble.
Because it is a polished marble made of calcium carbonate it makes it acid sensitive.