for all my S-100 boards built so far I have used 0.7mm 'Multicore Crystal 511' 60/40 solder which has good wetting and flow properties.
I usually use an old toothbrush and the above solvent to liquify the flux residue then immediately wash the PCB with a little
liquid soap detergent and water in the kitchen sink. Once you are happy it is clean (no flux or detergent bubbles) then
shake off excess water and warm board with a hair dryer to evaporate visible water, then place the pcb in a warm
cupboard overnight to drive out any possible trapped moisture in IC sockets etc.
Never had an issue with this solvent attacking either the silkscreen or board laquer, but always test before use if your pcb comes from a different 'PCB house'
also note that I always use 'sealed' dip switches because of my cleaning method - never had a problem yet.
see attached picture
On Saturday, January 10, 2015 at 2:51:58 AM UTC, Todd Miller wrote:
I'm getting ready to build the 8080A CPU board, so there's going to be
allot of solder points. I use Kester 24-6040-0027 21awg solder, but was
wondering if there was a better solder in regards to flux clean up.
In the past, I have used Acetone, carb cleaner, brake kleen and Blue
Shower to clean PCB boards. The 'cleaner' I use varies based on how
the solder mask reacts with the 'cleaner' Some chemicals make the
solder mask or joints look white.
Most of the time I use q-tips and Acetone, but I'm looking for a bulk
clean. I want the board to look nice when done.