I've bought some auction watches, and all of the bracelets are gross, some irredeemably. And even when I look at my own bought-new watches, the bracelets start to get gross very quickly.
I've noticed that my silicone strap gets whitish gunk on it pretty quickly, and I wipe it off with alcohol wipes. But bracelets hide the gunk.
How do you clean bracelets? I use tooth picks and wipes, but you can't get everywhere, and you probably don't want to remove all the lubrication. I've used ultrasonic for eyeglasses, but the thick petroleum jelly nature of bracelet goop would hold up fine to ultrasonic.
The other week I took apart two short bracelets for a model of watch that I had bought two of at auction and attempted to assemble a single bracelet that would fit me. This required more than usual disassembly, and I saw that the goop was way down in the holes for the cotter pins and everywhere.
Maybe I need to try a combination of carcinogenic acetone in an ultrasonic cleaner for 24 hours, and then re-lubricate with machine oil? Or just buy new bracelets.