How often should you replace your contact lens case?

Contact lens case: If you do not keep it clean and carry it in your pocket it should be replaced before it looks like a container that your lenses should not be in. Or to be more specific every few weeks.

When it wears out: However you should clean your case every time you put your contacts in your eyes. Clean it by rinsing thoroughly with tap water and allowing it to air dry. Do not reuse contact lens solution. It will work only if you use new solution out of the bottle everytime you put the contacts into the case.