Apply a sufficient amount of concentrated liquid detergent to the grime using a damp and soft non-abrasive cloth, then clean the rest of the surface with the detergent as well.

For especially greasy grime, try a liquid gel with ammonia.

Allow the detergent to take effect (1 minute should be enough), then rinse the entire surface with a sponge cloth and moderately warm water.

Dry with a soft and clean cotton cloth.

Repeat if needed.

Cleaning products do’s and don’ts

As a rule of thumb, to be safe always test new products on a concealed part of the surface to be cleaned.

Avoid aggressive or corrosive cleaning products, abrasive solvents and materials. Keep in mind that the use of abrasive sponges and cleaning powders can cause the dulling of surfaces, removal or peeling or their protective film, or erosion of parts of the surface pattern.

Avoid using bleach, ammonia, or solvents such as acetone or alcohol.