I've had this a couple of times. First time, I used soap and water and only helped for a short time only from my experience. brought to my AD and after ultrasonic wash, it lasted only a minute. Sent to RSC and came back squeak free.
More recently when this happed to another new acquisition, I placed a drop of mineral oil to the link and then washed the watch and bracelet with soap and water and it's been squeak free for a few months.
