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Lemon Test - The lemon test is to determine the ability of your granite to resist etching. Follow the steps below: 1  Place a wedge of lemon or lime, cut side down, on the sample overnight. 2  Wipe the sample in the morning and hold it at an angle to the light.  Check for a rough spot where the lemon was placed.
Granite is very different than marble countertops or limestone countertops, so first make sure you are dealing with granite. You can test your stone to see if it needs sealer by putting a few drops of lemon juice in an inconspicuous place.oap Film On Granite Countertops. If you have cleaned your granite tops with dish soap, you can remove the soap film buildup with MB- 3 Soap Film Remover. Simply spray on and wipe away soap buildup. This will return the shine to your granite tops.