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How to Clean Flux From PCBs

by: Mar 18,2014 18167 Views 0 Comments Posted in Engineering Technical

printed circuit board PCB

Flux is used when soldering electrical components to a printed circuit board. Depending on the components and type of solder used, flux is applied to solidify the electrical connection. The residue left by applying flux paste, or solder flux is usually removed to prevent inhibition of printed or etched wiring, and to avoid obscuring other components. Removing flux from a PCB is a simple task.


1 Dip a clean toothbrush in isopropyl alcohol or acetone. Flick away excess by flipping your wrist two or three times.

2 Use the toothbrush to gently brush the solder flux on the PCB, applying the alcohol or acetone. Do not use too much pressure, as this may cause the solder point to break. Repeat as necessary, to remove remaining flux residue.

3 Wipe down the cleaned area with a clean rag. Rinse the toothbrush in distilled water and allow the PCB to dry. Remove any flux dust with canned air.

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