Almost forgot: on each bath I'm wet cleaning them by using a brush (dipped in IPA) an on the last bath I leave the IPA to get a bit warm this way, when I'm getting the PCB from the cleaner the IPA will dry out fast with NO traces of any flux.
Only PD-223 or UV-223 flux are involved. I had issues with other types I tried... It leaved traces regardless how many times I tried to clean up the PCBs...
I try to stay away of any water variants (DM or other ...)! I cleaned using DM water many years back and had problems with via corrosion. Petrol products are good to a degree but stinks

I hope it helps!


, but it DOSEN'T WORK for XC32 5.00 