I used to clean mine about every 25k miles. I'd wash them as recommended and then put them in my mailbox for a few hours to dry (kind of like a small oven) on a sunny day, re-oil, reinstall and go.
Have had them on many cars with no issues (still have dual K&Ns on my 240Z) but not on any of our others now.
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Randy in Nashville
Middle Tennnessee Z Club
1971 240Z
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