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You can certainly make an improvement by painstakingly combing the fins, but you won’t make the heat exchanger like new. I have done this on some cars. The fins are staggered so you are really going row by row and nit combing. I use a small thin screwdriver and a small pair of needle nose. Have fun.
As for the screen, too fine a mesh blocks airflow. I don’t know what the ideal mesh square is. 1/4? 5/16? 3/8? Have thought about this myself. You can make your own, but Zunsport and other companies may sell premade ones.
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