Cleaning and maintaining your iPhone case is fairly simple. First, remove the case from your phone. Next, you can either wipe it down with a disinfecting wipe or handwash it in warm water with hand or dish soap. Make sure to clean both the inside and outside of the case and dry it after washing.
We do recommend that you check to see if your case came with care instructions; if so, your best bet is to follow these for proper cleaning, otherwise the above methods should be suitable.