That's looking a lot neater. I use a toothbrush and acetone to clean the flux away from the area worked on - be quick and it flushes away the flux and doesn't leave any white residue like metho/alcohol. Be too slow or aggressive with the toothbrush and you risk taking off the screen printing or green soldermask.

This actually works VERY well on modern PCBs as the paints are much tougher but if you are careful the job will look a lot better even on older boards and it makes it so much easier to spot remaining problems.

We are nearly finished the reproduction Bally -35 MPU and will start on a replacement Zaccaria MPU middle of January. We will be able to supply a blank PCB at a very sensible price and you will be able to build up a brand new board based on modern PCB techniques - better plated through holes, tougher solder mask etc and we will even incorporate mods to allow for chips that are no longer available. As far as I am aware nobody has done this before - fully populated replacement boards, sure - but not the supply of a blank board at a bare bones price.

Here is a pic of our Bally MPU nearly ready for the PCB factory (these will be supplied with new strip connectors and a few key parts - target sell price $39):