Today my relative was using my iPhone & she accidently dropped chocoloate crumbs on its top. Now, the crumbs have fallen between my iPhone's clear plastic casing & the iPhone4. How do I separate the casing from the iPhone4? I have tried to clean watever I can by stretching the casing slightlyly backwards & cleaning beneath since I don't want to break the cover but how do I remove the plastic casing completely? The casing am referring to protects the iPhone, its not part of the iPhone but its tightly wrapped around the iPhone.