G-Shock GW-9200BPJ-1 - Manual (Page 137)

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• Remember that you wear your watch next to your skin, just like a piece of
clothing. Because of this, you should always keep your watch clean. Use a
soft, absorbent cloth to wipe off any dirt, sweat, water, or other foreign
matter from the case and band.
Dangers of Poor Watch Care
Rust
• Though the stainless steel used for the watch is highly rust-resistant, rust
can form if the watch is not cleaned after it becomes dirty. Failure of oxygen
to come into contact with the metal because it is dirty causes breakdown of
the oxidization layer on the metal surface, which leads to the formation of
rust.
• Even if the surface of the metal appears clean, sweat and rust in crevasses
can soil the sleeves of clothing, cause skin irritation, and even interfere with
watch performance.
Premature Wear
• Leaving sweat or water on a resin band or storing it an area subject to high
moisture can lead to premature wear, cuts, and breaks.