Glad I could be of help 
I have had a bit of a read on the internet and from what I understand the cycle is pretty much the same for ultrasonic cleaners. Firstly if your ultrasonic cleaner is fairly large you dont want to be filling it to the brim with expensive solution so you fill it with water and then put the watch mech in a beaker with the cleaning solution and stand that in the water in the ultrasonic. Secondly there seems to be an issue with cleaning watch mainsprings in ultrasonics, there is the possibility of micro cracks forming which over time could cause a fracture, if the mainspring breaks it can cause a lot of damage to your watch. There are 3 schools of thought here, one group of people claim they have done it for ages and it is fine, the second group clean the mainspring in a small jar of solution with a brush and the 3rd group take the route I think I would take and get a new mainspring which you would have to do anyway if yours was “set”. The peace of mind far outweighs the small cost of a new one. If its something a bit different and a replacement mainspring cant be found then I would use the manual method of cleaning the mainspring as I dont like to take chances.
Paul.
