No, it's not ANOTHER ultrasonic cleaner thread. Well, it is, but not the 'usual' type.

I've put it here so newer users can pick it up, and if it's of any help, maybe a mod could 'sticky' it.
Here's some FAQs and answers, and pictures.
Do I need an ultrasonic cleaner?
Don't be ridiculous, of course you don't need one!
Are they any good ?
Yes, they're very good.
Are they expensive?
No, you can pick a decent one up for £20 - £25
What can I you use them for?
Pretty much anything that won't get fucked by putting it in water, & fits. (Inc your OHs jewellery ! Brownie points for getting their stuff all sparkly clean!

)
Should I buy one?
Don't be ridiculous, of course you should buy one!
Do you need special cleaning fluid for an ultrasonic?
No. You can use just plain water, either cold or warm, you can use washing up liquid, Miltons tabs, or various cleaners designed for ultrasonic cleaners.
Ok, a picture paints a thousand words. Allegedly. So here's some pictures. A couple of nice mucky rda decks, and a Zeph drip tip that's been sitting in the vape stand for a couple of months.
I have an 800ml cleaner, and use 700ml of slightly warm water with 2 caps of Sea Clean fluid. (All non toxic & environmental friendly) You get a plastic basket to put your items in, you don't need to use them. I don't dry burn coils before going into the cleaner, as there's no point baking juice into the coil, and the cleaner will get into all the nooks and crannies on fancy coils.
You can see a slight distortion where the light hits the water while its running.
12 minutes, or 3 cycles later, this is what you have.
Both together.