Hi Aimee, I got the following from a granite countertop site.
For daily maintenance use a solution of clear non-sudsing ammonia. Another method is cleaning the surface with Grani-Clean. Gently remove any loose debris from the surface. Simply spray the Grani-Clean on to the surface and wipe clean.
The porosity of granite is very low, averaging 1/5 of 1 percent. As with any material, however, if a spill is left on the surface for a long period of time some residual staining may occur. The stain usually dissipates over time or can be removed with a Stainout Poultice Powder. To prevent the potential settling of a stain, we recommend sealing the surface with an Impregnator.
Granite is not like woods or metals it needs to breathe. Sealing the surface with a urethane or wax would prevent the stone from breathing, causing potential deterioration of the stone. An Impregnator penetrates the surface and provides for an easy cleanup on future spills.
Consult your local fabricator for information on which Impregnator they have found to be most effective.
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