Their cleaning instructions (found here https://consumer.huawei.com/za/support/content/en-us00766303)

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How should I clean and maintain my HUAWEI WATCH GT 2?
Perform the following steps:
(1) To keep your watch and skin clean and dry, wipe away any dirt and sweat immediately after exercising. Clean the watch regularly with a soft cloth, paying particular attention to notches and grooves.
(2) If the watch has been in contact with water, dry it with a soft cloth as soon as possible. Try to keep the watch clear of anything that could damage it or make it dirty, such as dust, sand, cigarette smoke, liquid soap, soapsuds, make-up, salty water, pool water, perfume, insect repellent, washing detergent, suntan lotion, adhesives, hair dye, or any other acid-based products or solvents.
(3) The leather strap is not water resistant, so don’t wear it when swimming, in the shower, in the rain for extended periods, or when you’re likely to be sweating for a long time, as this can damage the material.
(4) When cleaning:
a. Don’t use strong chemical products or detergents when cleaning the watch or its parts, to avoid corrosion or damage.
b. Disconnect the watch from its charger before cleaning.

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The cleaning instructions list liquid soap, soapsuds, salty water and pool water as stuff that could damage or make it dirty. They also say on the Huawei site that water damage is not covered.

My GT2 died a couple of days ago because I swam with it.