I know this is a bit basic, but my car came with a K&N induction kit, and the side which was facing upwards is completely black, fading through to the underside where the orginal red/brown colour can be seen. Is the filter knackered?
Induction Kit
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#1
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#2Here it is. Can i clean it?

Cheers -
#3yes you can, but some of the propper K&N air filter cleaner from Halfrauds
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#4Cheers, and I'm feeling your love for halfords there
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#5