Finally gave this a try. I picked a white solder mask to test out and purposely grunged it up. Shows before and after with about 15 seconds of warm water and a soft toothbrush. Case closed - my new solder :) I have some distilled water so I might try that out as well next time.
https://www.amazon.com/Kester-Organic-Solder-NTE-Electronics/dp/B01LYH81CU/ref=sr_1_1?keywords=Kester+331+Organic+Core+Solder&qid=1579623272&s=hi&sr=1-1 (https://www.amazon.com/Kester-Organic-Solder-NTE-Electronics/dp/B01LYH81CU/ref=sr_1_1?keywords=Kester+331+Organic+Core+Solder&qid=1579623272&s=hi&sr=1-1)
I got mine but haven't tried it yet. Super stoked, that looks great.
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I was worried for a second. Water soluble solder sounds like a problem, water soluble flux though..
Hadn't seen this stuff, thanks for the heads up! When my roll runs up I'll have to vibe it a go.
Make sure you clean it really well. Water soluble solder is corrosive and will eat your boards if not completely cleaned. It sounds non-intuitive but I saw a batch of boards get destroyed by it.
If you haven't already bought it, I would recommend not using it, actually.