Well since the filter is oil less the K&N cleaner really doesn't do anything. Since the K&N cleaner is pretty much a degreaser made to remove K&N oil.
This is just my own opinion but it should be fine as long as you completely dry it before putting it the car.
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New daily driver - Subaru BRZ Premium
Weekend fun/track car - '91 MR2 Turbo Gen3
Old daily driver - '88 MR2 Supercharged
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