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HKS don't recommend that you clean the filter element mate. They'd prefer you to buy a new one!
Probably with good reason.
But if you must, I bit of ITG oil spray wouldn't hurt i suppose
That's not strictly correct. ITG filter mucus is designed to work with ITC foam filters, not any old filter you happen to have handy.
In any case, the ITG gunk's tendency to fall off the filter and coat the car's airflow sensor is an unfortunate side effect of ITG filters. No reason why you'd want to curse another product with the same trait.
