Ultrasonic Cleaner Stains


New member
Wondering if anyone has seen anything like this before. I keep seeing stains on my boards after running them through my ultrasonic cleaner and letting them dry - looks like this: http://imgur.com/kPMe9Tg.

I use a CP500HT with Branson EC per Louis' recommendations. Is this a matter of not using enough Isopropyl to clean it off after the ultrasonic bath? Or perhaps not letting it dry correctly?