How To Clean A Circuit Board Without Alcohol. I'm using a generic brand of alcohol but it's 91%. Compressed air (either from a can or a compressor) can also be used to blow off excess water.
You need to apply the isopropyl alcohol on the soldering side and not on the electric components. Compressed air (either from a can or a compressor) can also be used to blow off excess water. Repeat step 2 and 3 a few times until the board appear to be thoroughly wet and clean;
There are a number of ways to deal with this type of contamination:
Gently scrub the electronic circuit board from both the sides; Alternatively, spot clean your circuit board with isopropyl alcohol. The most common way to clean flux residues from a repair area is to saturate a cotton or foam swab with isopropyl alcohol or another cleaning solvent, and rub it around the repair area. The other is using a special circuit board cleaning spray.