I was caught in a heavy rainstorm about 3 days ago and my iPhone died on me. I opened it up when I got home and dried off the components with a soft cloth as well as ordered a new LCD & Digitizer and installed those.

The screen works as it should but the backlight is still inactive.

My question is: Is 70% isopropyl alcohol enough to clean the logic board and connectors of the 3GS? I was planning on following the guide posted on this website inorder to do the fix but was just wondering if 70% was too little of an alcohol concentration.

Thank you for any help you may be able to provide.