No I have not tried that yet Eric. I assumed that the paint brush cleaner would contain caustic soda.

However, I discovered that if I coat the PCB with acetone and then turn it over and lay it on the glass top table for a few minutes, it rubs off very easily - not all of it comes off though. So I repeated this process a few times and have taken most of it off.

My wife was alarmed when she found me doing it on the table, I've been threatened with a painful death if I damage the table. But no evidence of damage so far. I did not use the table while using the paint brush cleaner!

So I'll try the caustic today and see if it removes the rest.

cheers,

__________________
Len

 

I think you will have MUCH better success soaking the boards in what ever liquid you use. I have newer seen a brush cleaner doing its job on a hard brush in a few minutes of rubbing with a rag.
Put your PCB in a flat glass tray with a lid and let it soak at least over night.