Rubber Strap Maintenance

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I love the rubber strap on my new Seamaster but, like all straps and bracelets, it’s starting to collect grunge. Any tips on proper maintenance? Soap and water? I don’t want to do anything that will harm the suppleness of the material.
 
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563
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1,260
303 aerospace protectant.

Interesting product. Maybe I’ll give it a try on the car trim first. Thanks for the tip!