Just went to the K&N website, I had no idea they sold a washable cabin air filter. I'd throw it in the trash and buy a disposable one.
I have one in each car and they work just fine. The rubber surround and media appears to be very high quality. I wasn’t expecting much (which is why I purchased from Amazon, so I could return it, if need be) but they’re very nice.
Isn't K&N filter oil vegetable based oil anyway. I think you're overreacting to possible carcinogens, the carpet and plastic dash release 1000 times more carcinogens like formaldehyde into your cabin than an over oiled cabin filter.
I wouldn't want oil on my evap coil. I am not a huge fan of k&N filters. There was one installed on my buick when I bought it and I tossed it. I might be interested in a a Cabin air filter though since its not oiled. Cabin air filters are expensive and they last way less time in my opinion than an engine air filter.