If you have cultured marble, make sure that your product says it’s for cultured marble. If you do not have access to a polisher, you can apply your marble polish with a soft rag; however, this method is very tiring. [3] X Research source If you have stains, remove them with a poultice before polishing. [4] X Expert Source Guy PetersHouse Cleaning Professional Expert Interview. 12 July 2021. Keep in mind that if you use a poultice you will need to wait at least 24 hours to continue to the next step. [5] X Research source Use an etch remover polishing compound if you have water rings.

Cover wood and chrome surfaces. If you have wood floors, consider taping around the edges of the bottom of the cabinet if you will be using a spray product because the product could land on the floor.

You can purchase a commercial poultice or you can make your own. To make a poultice, mix just enough hydrogen peroxide into flour to create a paste. [8] X Research source You can also use a combination of one tablespoon ammonia, half a cup hydrogen peroxide while slowly adding baking soda until it forms a thick paste. [9] X Expert Source Guy PetersHouse Cleaning Professional Expert Interview. 12 July 2021. Smooth the poultice onto the stain and seal it by taping plastic wrap over it. Leave your poultice on for at least 24 hours. Old stains may require more time. Determining the time needed to remove old stains is a trial-and-error process. [10] X Research source After 24-48 hours, remove the plastic, pour a little water over the dry poultice, and wipe it away with a soft cloth. Thoroughly dry the area. If the stain persists, repeat this process again.

Do not apply polishing compound to the entire piece of marble at once. [12] X Research source How much polish you should apply will depend on the type of polish you choose and the size of the space you are polishing. If you are not sure how much polish to apply, start with a little and add more as needed. It’s easier to add more than it is to remove excess.

If you have a drill, you can replace the drill bit with a felt-top sanding disk so that you can use it as a polisher.

Start in a corner and work your way around the entire area to make sure you apply an even polish. If you start in the middle, then you may miss a spot.

Use a low to medium speed if you’re using a polisher.

If your cultured marble still has stains or shows damage, you can polish it with a buffing compound and then again with a polishing compound. If neither of these products works, cultured marble can be wet sanded using 1,000-grit wet/dry sandpaper. [18] X Research source Don’t try buffing compound or wet sanding on natural marble because it is more easily damaged.

Don’t seal cultured marble because it’s stronger and doesn’t need a sealant. Some cultured marbles won’t take a sealant. [20] X Research source You don’t need to seal marble in a shower unless you plan to use products that stain. Personal care products don’t stain marble unless they’re allowed to sit. Shaving cream can cause etching, but that’s not prevented by a sealant.

Don’t let the sealant fully dry or it will streak. You can add water to the sealant by spraying on water or dabbing with a damp cloth. Adding water to sealant that is drying too fast will prevent streaking.

Most sealants recommend a wait time of 10-20 minutes. [22] X Research source If you let it sit longer than the recommended time, the sealant will streak. If your sealant recommends two applications, then repeat the steps once.

Marble should be sealed every 6-12 months.