Metal prints are more durable than acrylic, however they are still highly susceptible to scratching so extreme care should be taken while handling and cleaning your metal prints.  Try to use a feather duster to clean them first and if this does not work then only use a damp microfiber cloth to gently clean the surface.  Ensure that you are using very light pressure and never use any cleaning solvents, alcohols, paper towels etc. as these may damage the surface of your artwork.