Hi Luke
I use Horotech cleaner and rinse. The smallest quantity you can but is 1 litre.
When i started using this I got it wrong a few times, so hopefully you might find this useful.
The best way i found was to put about 1cm of cleaner in a small lidded jar, and the same amount of rinse in 2 other jars and label each jar - Cleaner, Rinse 1, Rinse 2. Then fill the ultrasonic cleaner with warm water as normal, with the plastic mesh basket inserted. Then put the parts you want to clean in the cleaning solution jar and then into the ultrasonic cleaner. Once that is done transfer the parts to the first rinse, I usually rest the parts on kitchen paper first to soak up most of the cleaning solution. Once that is done move them to the second and final rinse, then dry.
For the balance jewels I use Bergeon one-dip solution in a smaller jar and only give them a quick 30 second clean and then dry.
I have no idea if this is the correct process to use but it works for me.
Cheers
JIm