Ultrasonic Cleaners

== WARNING ==
Despite being useful for post-repair cleaning, many people use this device to "fix" a dead-end device.
Please don't do that under any circumstances if there is valuable customer data on the device. Escalate it to a different repair store with proven competence or reject the repair.
USC CLEANING IS NOT REPAIR
Example:
This Mac was properly cleaned and all visible damage was repaired by one of our community members. Since there was random corrosion, the tech decided to do a proper USC clean. 
Technically he did nothing wrong, and the device was properly dried after that. This device arrived to me approximately 3 weeks after the USC, so there is zero chance there was any residual liquid.
The original issue was a broken i2c clk line, which prevented NAND power from working. It was really hard to find because the affected line was corroded under the mask, and there were zero traces, but the standard M1 power sequence helped me pinpoint the issue.
After finding and fixing the original issue, the Mac turned on and then turned off again after a minute, with a smelly 3v8 short to ground. After removing the sticker, I found that the SPMU had a very nasty hole in it, which would mean a dead CPU and no data in most cases.
It is maybe okay to use USC as a last resort on non-data recovery cases where you expect liquid under the SoC. However, it is strongly NOT recommended to USC boards in any data recovery cases. Data is not replaceable, and the 1% chance it will fix invisible damage is not worth the greater chance of killing the board. USC cleaning became popular on older machines with detachable SSD drives, and it was a valid technique which even fixed reasonable amount of boards. Now it is very different, because of integrated SSD drive and much more dence PCB complexity on newer macs. 
Why you should just get a crest ultrasonic cleaner if you're fixing boards professionally:
Every other generally available brand of ultrasonically cleaner simply doesn't work as well. If you want to know why see below.
The product description on the rossman groups website has a good description of the advantages of crest's machines and has some pictures comparing the cleaning of a crest machine compared to another manufacturer's machine. 
Link - https://store.rossmanngroup.com/crest-p1800h-45.html
List of available models:
https://crest-ultrasonics.com/benchtop-ultrasonic-cleaners/?gclid=EAIaIQobChMImeva2aqU9wIVBv_jBx374gS8EAAYASAAEgKM0fD_BwE
Something the size of a P1200D can fit any current macbook logic board , some large boards may not be fully submerged and you would need to flip them more time to get full coverage on the board. 
Dilution levels to use in tank:
Concentration of Branson electronics cleaner should be between 3-5% and the rest is distilled water. 
For Example if you had a 1200D cleaner, the tank is roughly 2.4 gallons or 9200ml, so you'd want 275ml- 460ml of Branson EC, the rest of the tank would be distilled water. 
*DO NOT use tap water or isopropyl alcohol in an ultrasonic cleaner or any other combination of chemicals.* 
*Use Branson EC and distilled water, that is all.*
Whenever you refill or plan to use the cleaner, you should run the degass setting to get rid of any air bubbles in the solution, air bubbles hitting the board can cause cavitation, not good.
Your tank is filled, you've degassed the solution of branson and distilled water and you want to clean your boards, here are the settings that are widely used: 
Crest Ultrasonic settings:
Temp: 68 C
Power: 9
Set timer for 4 min 
4 Minutes of each side of the board
General Tips:
-It is a good idea to remove any stickers, heatsinks and shield plates before putting a board in an ultrasonic. Stickers will be ruined by the ultrasonic process and shields will stop the cleaning process from working effectively in those covered areas. 
-If you've been doing rework on a board, it is recommended to clean off flux residue from the board before putting it into the ultrasonic cleaner as you can get more uses of a solution in the tank before it needs to be cleaned out and refilled.