Iphone 4 rear camera blurry?

My rear camera on the back of my Phone is blurry and I don't understand why. I have dropped it many time but nothing as ever cracked. Only the front of the phone as cracked in the right bottom corner but the front camera is fine. Any solutions? & How much would it be to get my cracked fix? Or even my whole phone is the rear camera is broken.

Added (1). I have cleaned off the camera multiple times.

Clean the camrea off?

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