How to remove flux from circuit boards In this video I am sharing a simple method to help you clean flux residue from your PCBs. Let me first explain why we need to clean flux residue. Cleaning flux residue from circuit boards is a crucial step in the electronics manufacturing and repair process. Flux is used during soldering to help clean and prepare the metal surfaces, allowing for a strong bond between the solder and the components. However, once soldering is complete, the flux residue left b