Clean cultured marble daily with warm water and a small amount of dish soap. Wipe the surface dry with a microfiber towel. Avoid any cleaner that has abrasive ingredients or contains grit, such as cleansing pads or powdered cleaners, and avoid any alkaline- or acid-based cleansers.
If the cultured marble in a shower or bath is showing signs of soap scum build-up, combine a mixture of 50 percent vinegar and 50 percent water in a spray bottle, and wipe the surface with a little of the mixture and a soft cloth. Rinse the surface with warm water, and use another cloth to restore the shine of the marble. Use a squeegee to remove excess water after each shower or bath to reduce soap scum issues. If you have hard water and it stains the marble, use the same solution, but allow it to sit on the surface for about 30 minutes.
To remove sticky residue, such as wax, toothpaste or gel, use rubbing alcohol applied with a cotton ball or soft cloth. Rinse the area with warm water to remove the pieces of residue. If the marble is completely dull or has not been cared for in years, use a mechanical buffer, or use car wax after rinsing the surface clean. Apply wax to the surface, allow it to dry, and then use a clean microfiber or cotton cloth to wipe up the wax. Use a second clean cloth, and buff the surface to make it shine.