I've done it on multiple 986s and 996s and always gotten a good amount of crap out, but it is of course heavily dependent on where and when you drive your car. I believe the condenser and radiator are both aluminum so rust is of little concern, but it does block airflow through both and degrade your radiator and A/C performance.
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Matt J.
2001 Boxster S Supercharged, 2010 E63 AMG
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