Cleaning a Lens

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It seems that no matter how hard I try, I can't get a lens or filter totally clean. Either the cloth leaves behind some dust or lint, or I get streaks. I use isopropyl alcohol with distilled water and a lens cloth. Can someone tell me what in the world is going wrong.

I know it's the lens because if I switch from my 300mm (the one I found the problem with) to my 70-200 or my 18-55 the specks in my pictures disappear.
 
I start out blowing off the dry lens to get any large particles off the lens. Then I use a couple drops of eclipse (ethyl alchohol) and then wipe it with a microfiber. Rinse and repeat.
 

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