First remove everything. Then vacuum or dust off all crumbs. Then wet a white nylon backed sponge with dishwashing detergent solution and use the sponge side to go over the counter, including the backsplash. Let the solution set on the surface for a few minutes to soften hard droplets. Then, use the nylon side of the sponge as necessary to remove any stubborn stuff. Buff dry with a clean, lint free towel. If your countertops have lost their luster, try furniture polish or club soda to give a temporary shine to your kitchen.
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