Watches.
Over time,wristwatches with metal bands can collect dead skin,dust,
and dirt in between the links,hinges,and mechanical parts.
If you have a waterproof watch,a quick way to keep it clean is to soak it in bathroom sink with sudsy water,
rise clean,and then use a Q-tip to pick up dirt i between each link.
If you have an espresso maker with steam nozzle,you can use that to steam away dirt,too.
Just be sure to use something to protect your hands from the hot steam,like miniature tongs or extra-strong tweezers.