How To Clean A Circuit Board Without Alcohol. The canned air is your best solution. Do not use the rubbing alcohol that you used for the circuit board because it can remove the ink writing on the buttons, as well as cause the rubber to dry out and deteriorate.
To properly clean your electronic circuit board you will need cotton swabs, 99% isopropyl alcohol, and a small bowl. To clean a circuit board, try using compressed air. For a more thorough clean, put some 91% or 99% pure isopropyl alcohol in a spray bottle, then spray the board down with the alcohol.
Once everything checks out, you may also want to envelop the edges of the new pad/trace with epoxy or solder mask to give the area increased mechanical strength.
The best way to avoid esd is to just be careful when you are handling the parts. Swab gently in stubborn areas and be careful not to upset the components. Best ways to clean a corroded circuit board. Today, nearly half of all printed circuit boards (pcbs) are assembled with no clean solder paste.