Although it is true that the sealer will wear away over time, there is a straightforward removal process for both oil- and non-oil-based asphalt sealers.
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Mix a cleaner such as Simple Green with a full bucket of water. Place a drop cloth over the asphalt surface that runs alongside the bricks.
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Wet down and scrub the bricks with a scrub brush and the cleaning mixture. Allow the cleaning mixture a few minutes to settle on the asphalt sealer.
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Rinse the bricks using a power washer. Set the psi (pounds per square inch) to 800 or less by rotating the dial in a clockwise direction. Too much water pressure will damage the brick. Repeat the cleaning and rinsing process as many times as needed to remove the asphalt sealer.
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Pour a solvent cleaner such as Solvall directly onto the oil-based asphalt sealer. It is important to wear safety glasses and gloves during this project. The asphalt sealer can damage the skin and eyes.
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Scrub the area briskly with a scrub brush. Let the solvent cleaner soak on the sealant for several minutes.
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Turn the power washer on and set the pressure control dial to 800 psi by twisting it in a clockwise direction. Rinse away the asphalt sealer and solvent cleaner. The solvent cleaner will emulsify and render the oil-based sealant harmless to the environment.