User Maintenance; Dangers Of Poor Watch Care; Rust - Casio WSD-F21HR User Manual

User Maintenance

Caring for Your Watch
Remember that you wear your watch next to your skin, just like a piece of
clothing. To ensure your watch performs at the level for which it is designed,
keep it clean by frequently wiping with a soft cloth to keep your watch and
band free of dirt, sweat, water and other foreign matter.
Whenever your watch is exposed to sea water or mud, rinse it off with clean
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fresh water.
For a resin band, wash with water and then wipe dry with a soft cloth. Note
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that sometimes a smudge like pattern may appear on the surface of a resin
band. This will not have any effect on your skin or clothing. Wipe with a cloth
to remove the smudge pattern.
To clean the metal parts on a resin band, use a soft toothbrush or similar
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tool to scrub the band with a weak solution of water and a mild neutral
detergent, or with soapy water. Next, rinse with water to remove all
remaining detergent and then wipe dry with a soft absorbent cloth. When
washing the band, wrap the watch case with kitchen plastic wrap so it does
not come into contact with the detergent or soap.

Dangers of Poor Watch Care

Rust

Though the metal steel used for your watch is highly rust-resistant, rust can
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form if your watch is not cleaned after it becomes dirty.
Dirt on your watch can make it impossible for oxygen to come into contact
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with the metal, which can lead to breakdown of the oxidization layer on
the metal surface and the formation of rust.
Rust can cause sharp areas on metal components and can cause band
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pins to fly out of position or to fall out. If you ever notice any abnormality
immediately stop using your watch and take it to an authorized CASIO
service center or to your original retailer.
Even if the surface of the metal appears clean, sweat and rust in crevasses
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can soil the sleeves of clothing, cause skin irritation, and even interfere with
watch performance.
EN-117