Mineral Spirits Acetone then a stiff nylon brush

then a stiff nylon brush and bucket of water may suffice

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The Clean & Protect Value Pack provides everything needed to remove graffiti from porous masonry surfaces and help protect them from future vandalism

carbon deposits

Mineral Spirits Acetone then a stiff nylon brushProduct Description Mineral Spirits (<1%) is a low odor, versatile solvent is ideal for cleaning, degreasing, and a wide range of industrial applications. It effectively removes grease and residues while offering user safety and environmental considerations through its low vapor pressure formulation. Mineral Spirits is commonly used as a thinner for oil based paints, stains, varnishes and polyurethanes and inks, and degreaser in various industries.