Fill the sink with water.
Make sure to close both the charger jack and the earphone jack!
Completely submerge your iPhone in the sink of water for 30 minutes. Make sure your phone is somewhere safe where it will not get wet, and not IN the case.
Take the case out of the water after 30 minutes.
Dry off the OUTSIDE only of your case.
Taking apart your case!
Check to make sure the inside is completely dry.
Once it is, put your phone back in the case and be confident that your phone is ready for anything!