make a paste of acetone (NOT nail polish remover. Get the real deal at paint store) and cornstarch, spread on stain and tape plastic wrap down over paste overnight. Remove plastic wrap and let it dry out. Sweep up cornstarch. Be careful, acetone is flammable as Hell. Even the simple act of flipping a light switch can cause a spark. Don't burn your bloody house down.
Other food stains may respond better to #40 strength peroxide from beauty supply store. Mix and apply similar to above.
You gotta re-seal countertop after either of these procedures
DIY, Rehabs, Restorations, etc
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