Cleaning back spots off of the rear camera

I recently replaced the rear camera on my iPhone 5. The new camera works great aside from some dust spots on the lens. I disassembled the phone and cleaned the inside glass and outer glass of the assembly and cleaned the lens thoroughly but the spots are still visible. Could it be a faulty camera or am I just not cleaning it well enough? Any tips on cleaning the lens? I was using a semi-damp cuetip

http://i61.tinypic.com/2wd2hqs.jpg

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