Clean granite surfaces with a mixture of neutral dishwashing liquid and water. If the granite has stains, a powdered whiting product, such as talc, and hydrogen peroxide is also needed. You also need a sponge, a large bowl, a microfiber cloth, tape and plastic wrap.
- Create the cleaning liquid
Add a few drops of neutral dishwashing liquid to a large bowl of warm water, mixing the liquid and water thoroughly until suds form.
- Wash the granite
Soak a sponge with the cleaning fluid, and then wash the granite surface with the sponge until you remove all dirt and debris. Rinse the sponge thoroughly using hot water, then wipe off the granite surface with the clean damp sponge, removing any suds from the surface. Repeat the process if visible lines of residue remain on the granite or if the finish looks dull. Dry the surface using a microfiber cloth to complete the cleaning.
- Create a poultice to remove stains
To combat tough stains, create a poultice consisting of powdered whiting and hydrogen peroxide. Follow the powdered whiting manufacturer's instructions to create a thick paste in a bowl by adding the liquid to the powder.
- Remove the stains
Apply the paste to the stained area, making the layer about 0.25-inches thick and overlapping the stained area by 0.5-inches. Tape a piece of plastic wrap over the paste and allow the paste to dry, up to 2 days, until hard. Wipe away the paste with a sponge, and then rinse off the surface with clean water before cleaning the area with the neutral dishwashing liquid mixture.
Once the granite surface is thoroughly cleaned, it can be polished using a store-bought or homemade polisher. Due to the porous nature of granite, it should be cleaned daily with the appropriate cleaning supplies to avoid permanent damage. When using a new cleaner, testing a hidden area of the stone helps to make sure the cleaner does not negatively impact the integrity of the stone.