If I know correctly...
Ultrasonic cleaning simply wasn't and isn't appliable to laundry....though ultrasonic is good for whatever metals.
The prinicniple in ultrasonic cleaning is the vibration , first you have two distinctions to make absorbent and not absorbent materials, then hard and not.
Ultrasonic cleaning finds it's use typically for hard surfaces and non dirt absorbers, so supertficial dirt that only will and can be superficial, not absorbed and part of it, then you have to consider another aspect, some materials even though being hard not absorbent will vanify the sonic action as they will absorbe the sonic and will not vibrate....and AFAIK it never had a large application outside of metals fot that very reason.
Sonic cleaning is not only for jewels, but finds applicaton in many other fields involving metal cleaning.
Coming from a family of jewelers and goldsmith, and what is considered the "town of gold and jewels" I was raised among sonic jewels cleaners and you can hear their very disnticnctive sounds as you walk by the roads of this town coming from factories and shops, they're commonly referred as "insaponatrice"- "soaper" in slang term among jewels folks.... we have 3 sonic machines..
Jewel and metal cleaners will require soapy water and hot water (they typically heat their own) anyway..
As I was saying the sonic cleaning could mostly and largely take application in the metal cleaning because metals were about the only material that could satisfactorily take advantage of this "force", the principle as I was saying is the sonic vibration, these vibrations will do about nothing to a cloth and it's dirt, because clothes (both wet or dry) absorbe and vanify in first the vibration, for second water soaked clothes are almost like being water themselves. and for last but not least important the most of dirts absorbe vibrations and won't vibrate the same... you have to e find a way to "vibrate" either the dirt or the item....
Metals are the material that most react to a sonic vibration, infact the principle relies in the fact that vibrations will reflects on the metals and it's actually the metal vibration who will detach dirt (superfical dirt) gunk and whatever on them....it's the object that vibrate for reflection and do the job, in very poor words "kind of shake the crap off it"... not the dirt or water.
This is what I knew....
An hint: They says that all the plastic jewel cleaning machines they sell now for domestic use (even though labelled as professional) are nothing but a joke, let alone the battery operated ones...
Jewels cleaning typically involves a few more operation than just dropping them in the machine also...
It's a 5 minutes job anyway, when we had the shop we charged like 2-3 bucks for object, many times we also did for free......
All but a professional machine is throwing money.....
This is how a REAL professional one looks like:
Luigi Dal Trozzo, dal 1918 forniamo gli orafi di tutta Italia. Attrezzature per orafi ed argentieri.
www.luigidaltrozzo.it
All the rest are toys....
[this post was last edited: 1/9/2015-10:01]