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Cleaning a circuit board with an ultrasonic cleaner is the fastest and most efficient way to remove no clean flux, dirt, dust, and other small particles that have accumulated on the board.
Now before we get into the steps there is something very important that you will need to know. This process is for circuit boards with nothing on it or with components that are waterproof only! Also almost all solutions used for a process like this one involve using water which can damage the board if it is not properly removed or protected. Also, for the purpose of cleaning electronic based boards you want to use a saponifier. It is a solution made solely to react to the acid residue left on the board to create soap like substance to wash away easily.