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Don't try to disinfect the case while it's still on your phone. The disinfectant could get inside your phone and damage it. If the phone case has multiple parts, separate them by pulling the inner piece out from the hard outer part of the case. Use rubbing alcohol that’s 70 percent or higher. If the rubbing alcohol you’re using is in a spray bottle, you can spray it directly onto the phone case instead of using a cloth. Wipe down both the plastic and silicon parts of your phone case. Make sure you wipe down the inside and the outside of the phone case with the rubbing alcohol. Try to get as much of the rubbing alcohol off as you can. The phone case should feel mostly dry to the touch when you’re finished. Set the case somewhere it can air dry for an hour. After an hour has passed, put your phone back in its case. Get in the habit of disinfecting your phone at least once a month so it stays clean.

Summary:
Take the phone case off of your phone. Soak part of a soft cloth in rubbing alcohol. Wipe the phone case down with the alcohol-soaked cloth. Wipe off the rubbing alcohol with a dry, soft cloth. Wait an hour before you put your phone back in the case.