Okay , how did you get it out of the grill ? I have the same problem (Yes , believe it or not) I got cheese stuck in the grill of the rear speaker !!! I have no idea how it got there !!!
Well, I can tell you what not to do to get it out. Don't suck on the speaker grill. I did that and apparently the vacuum created inside the case as enough be suck in and crack the glass that covers the rear camera lens.