Question for the Speck Presidio Grip owners... how often are you removing the case to clean your iPhone? I just got one of these for my 7 Plus. It feels so good in hand, and fits the phone so well that I don't feel like I would ever need to take it off? Every other case that I have owned has eventually accumulated dust and lint on the inside of the case? The Presidio feels like it has a rubber gasket sealing itself to the phone? Is there still a need for routine maintenance?