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While I agree that doing ANY cleaning is better than none, I would recommend a bumper off clean to every car that has never had it done.
IIRC, the front radiators are for the AC, and the bigger rear ones are for the coolant. Since you aren’t cleaning the rear radiators at all, there will still be some airflow and thermal issues.
I was amazed at how much stuff came out of mine at 114k miles, and I believe it had been done before!
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