Factory watches ChinaThere are many types of stainless steel, the main components of which are nickel and chromium, and nickel, chromium and the like are susceptible to strong acid and alkali corrosion. The sweat discharged from the human body contains hydrochloric acid. When wearing a watch, if it is often contacted by sweat or allowed to watches made in china wholesale accumulate acid and alkali salts, it will not be cleaned up in time, and the rust will appear slowly on the strap and the black will appear on the wrist. Smudged. This is mainly due to the contact of elements such as nickel contained in stainless steel with sweat or vinegar, bleach, correction fluid and other chemicals, chemicals, cosmetics and other substances in the human body. The general treatment method is to gently wipe the strap with a soft toothbrush and spanish watch manufacturers a cleaning agent and then dry it with a soft cloth; or use an ultrasonic instrument to clean the brand authorized service station.