So, I have only ever spotlessly cleaned about 2 of the 60 or so keyboard PCBs I’ve built. It’s a huge pain in the ass for me.
I don’t use any additional flux on new boards when I solder, only the rosin flux in the core of my solder. But it does manage to make quite a few small sputters on the PCB.
For cleaning, I use 99% Isopropyl and a ton of cotton swabs to get all flux residue off the board. But yeah, that method takes me like at least an hour.
Is there an easier way? How do you clean the flux residue off of your boards after soldering?