Clean, clean, clean away! I use my small, but mighty, ultrasonic for
everything. Cleaning daily dirt, rinsing off boric acid residue and
removing those pesky polishing compounds.
Bear in mind, hot water is best (so do polishing later in the day,
after water has had a chance to heat), I use a commercially
available blue cleaning solution (from Stuller) and turn the
ultrasonic waves on. Be careful with fragile gems (when in doubt,
check gemstone durability resources before putting in cleaner) and
don’t leave silver in too long (it starts to etchand get frosty
looking). In fact mixing gold and silver can sometimes be chancey,
especially if you leave a silver piece in overnight.
But, in conclusion, the ultrasonic cleaner is an indespensible,
fantastic tool and can be used for cleaning almost anything.
Hope this helps.