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Bytesize
sorry, no green "crud" as you so eloquently put it is left on the board after it's been in the crest, corrosion yes but no green stuff 
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Andy @ ACE-Repairs
give it a good toothbrush scrub and chuck it back in [cool]


PS how long did you put it in for?  and what temp?
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Atomrepair
Hehe, I didnt get a UC to break out the toothbrush! I want this thing cleaning the parts I can't see, if it cant clean what I can see then I be sad [frown]
I ran it at 65 degrees celsius, sweeping frequency activated. Most of the board was in for ~3 minutes per side (I changed orientation four times). As that left the part in the image looking nasty, I put mainly that part in for another ~25 minutes in the end, leaving it looking like the 'after' image... which is still not good enough.
Atomrepair
Logic board, motherboard and other repairs in The Netherlands
https://atomrepair.nl
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Bytesize
if the component looks really bad I always add flux and hot air first before ultrasonic, that may make a difference to my cleaning compared to yours
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Atomrepair
Thanks, I'll do that and give it one more shot. Just for the record; this is a broken 'for parts' board from alibaba I'm trying to clean, just to test the cleaner itself.
Atomrepair
Logic board, motherboard and other repairs in The Netherlands
https://atomrepair.nl
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Atomrepair
It looks the same after adding flux, heating it up and then cleaning it for another 3 minutes. Either this spot is uncleanable or the cleaner doesn't work well enough for this purpose. P1110822.JPG 
Atomrepair
Logic board, motherboard and other repairs in The Netherlands
https://atomrepair.nl
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Crea2k
This is basically what can happen if you use ipa in an ultrasonic cleaner :  http://www.telegraph.co.uk/news/uknews/crime/8636424/Boston-explosion-five-dead-in-huge-fireball-during-illegal-vodka-brewing-operation.html
that's ethanol, ipa is isopropanol, and equally as explosive. That's why bootleg moonshine setups in the usa have a large chance of explosions from the alcohol vapour.
i just use distilled water and a flux cleaning fluid similar to Branson ec, then use isopropanol afterwards to rinse with, then dry in hot air at about 80-100c. 

By the way you want to use a frequently sweep ultrasonic cleaner or you'll end up damaging something on the board. A frequency sweep does exactly as it says on the tin and sweeps the traducer over a large frequency area
instead of just blasting out one frequently. Different components will oscillate at different frequencies so it'll clean better than a static machine too. Mine cost about £700 I think and is the same one lous rossman and Jessa uses.
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