Cleaning marble frequently will help the marble hold its shade. Mold and mildew buildup on marble shower stalls can cause them to become slippery; be sure to clean your marble shower as often as once a week.
Moisten the sponge with warm water. Wipe and scrub down the entire shower stall. Use a little elbow grease to loosen any dirt and grime. Rinse out the shower with warm water to remove the loosened dirt and grime.
Mix 1/2 cup of bleach, peroxide or ammonia with one gallon of water.
Submerge the sponge in the cleaner mixed water. Scrub the walls and floors of the shower. Rinse out the shower as dirt and grime accumulate. Squeeze out the sponge as it gets dirty.
Submerge the sponge again in the cleaner mixture, and continue to wash down the walls and floors. This will clean off most of the mold and kill it.
Clean out the sponge again. Submerge it in the mixture, and squeeze it out over problem areas. Let the cleaner mixture sit for approximately five minutes. Scrub the problem areas with a soft bristle scrub brush to remove the remaining mold. Rinse out the shower.
Dip the toothbrush into the bucket of cleaner mixture. Scrub the grout with the toothbrush. Dip the brush every time it starts to dry out. As grime, mold and dirt accumulate rinse it away.
For problem areas on the grout, let the cleaner mixture sit for approximately five minutes. Scrub the grout again after submerging the brush in the mixture again. Rinse out the shower.