Chemical Stains / Acid Etching Contamination

Chemical-stains contamination, it arises from exposure to acids, bases, or solvents, causing discoloration and etching on surfaces. This pattern, it differs from rust or dust by its chemical bonding and uneven penetration, thus resists mechanical wiping. On metals like steel and aluminum, stains embed deeply and corrode, while on plastics such as acrylic and ABS, they cause cracking. Removal challenges include substrate damage risk, so laser cleaning works effectively by vaporizing stains selectively and preserving material integrity.