Magnetic Sign preparation, use and care. Before affixing magnet to a metal surface, clean the metallic surface and the magnet with mild detergent and wipe with a soft cloth or allow to dry. Be sure paints, clear coats and waxes are cured. Make sure the entire magnet is flat against the metal surface. Do not place over protrusions (molding, decals, pin striping, etc.) or concave areas. There must be NO air pockets. Remove the magnet weekly and after rain. Clean both the magnet and metal surface with mild detergent wipe with a soft cloth or allow to air-dry. Do not wash your car with magnet affixed. There is no warranty expressed or implied against loss of signs or damage to vehicle surfaces, as factory has no control over how signs are cared for, altered, stored, and/or used, or the surface to which the signs are applied. There is no warranty expressed or implied against loss of signs or damage to vehicle surfaces, as factory has no control over how signs are cared for, altered, stored, and/or used, or the surface to which the signs are applied.