Thank you for your support of Xiaomi products. Before leaving the factory, all devices undergo rigorous professional inspections to ensure high quality. A special anti-fingerprint coating is applied to the back cover to minimize smudges. However, due to the unique high-gloss finish of the Liquid Silver version, fingerprints and smudges can appear more noticeable under certain lighting conditions. This is a characteristic of glossy surfaces and not a quality issue. To keep the back cover clean, you can gently wipe the surface with a dry lint-free cloth or tissue. For more stubborn stains, use an alcohol wipe first to remove the oil and residue, then follow up with a dry lint-free cloth or tissue to restore the phone’s clean appearance.