Anecdote: I bought a used Tessueflex bracelet on eBay. These, like Evinger, are expandable mesh bracelets. Very nicely made.
This bracelet was so packed with "dirt" (I hate to think how much of it was rotting skin cells). I soaked this bracelet in ammonia for a long time, scrubbing, rinsing with very hot tap water. If it were any other bracelet, it would have been worn to junk years ago.
In this case, it was merely disgusting and I skipped dinner that night.
Wash your bracelets. If you're worried about your watch, take the bracelet off or have it pressure-tested. But I've been washing my (former) Speedmaster and Seamasters like this for ages, and my watchmakers have all approved because they see no issues inside my watches and know what happens to bracelets when you do not keep them clean.
Tom
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