I bought a K&N filter for my car 10 months ago and am finally getting around to washing it. The K&N stock cleaning fluid has a familiar smell to it but I cannot remember fimiliar to what? I was wondering what else can be used to safely wash their filters. I was thinking something like Simple Green. I would like to know what other K&N filter users are using to clean their filters?

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84 300D, 82 Volvo 244Gl Diesel