Metal bracelets tend to amass dust between the segments. Store them properly so they are not scratched. If you you’re wearing your watch while swimming or doing watersports, always rinse it with clean fresh water afterwards and wipe it dry immediately.
To clean your metal strap
Always consult with your watch manual before cleaning. To keep your metal strap clean, dust it frequently. For a deep cleaning, first remove the band. Use a baby tooth brush and mild soapy water to gently remove grime. Dry off your strap with a clean soft cloth immediately after. Place the band back on your watch. If you do not feel sure that you can perform the band removal and cleaning, consult with a professional.