Charge!
They are even nice enough to include instructions.
I've been a firm believer of using K&N Air Filters for many years and different vehicles I've had. I originally put this in my 2000 Chevy Impala soon after I first got it. They do recommend that that you clean and re-oil(Recharging as K&N puts it) every 50,000 miles. Though I didn't note when exactly I do know it's passed that mark. What I do hope to show is how to recharge your K&N air filter is done on my Impala.
The K&N OEM style Air Filter for my 2000 Chevrolet Impala with a 3.8 V6 is K&N part no.
33-2141-1. To clean it I need the K&N Recharger kit. They come in various sizes. The one I got was
K&N part no.99-5000 which includes cleaner and oil. I bought this a year or two ago but I believe they only cost $10-$12 in your local auto parts store or online vendors.

First you undo the top two clips of the air filter housing.

Though you can leave this part in I found it easier to just remove it. Be sure and remove
Intake Air Temperature Sensor.
Push back and the rear cover should lift right out.

5o,ooo+ miles of debris inside. While I had it open I cleaned it out.

It was dirty though not too bad. I followed the instructions and sprayed it down with the cleaning solution and let it soak for about 10 minutes or so and I rinsed with water. The instructions say to let air dry so I did this before calling it a night so I let it sit overnight to dry. Compressed air, hair dryer etc. are not to be used as per K&N saying it could damage the filter. At $40 a wack I'd rather not chance it. I suppose in a pinch you could just buy an ordinary filter as a substitute if you can't wait.

I woke up the next day. Grabbed the oil and soaked the filter with. I covered both sides as instructed.

I fit it back inside the housing.

Replaced the cover.

I then reassembled in reverse order. Now I'm good to go for another 50,000 miles. It's a fairly simple process. If you can change your air filter you can do this. So easy even a cave mechanic could do it. I hope this helps and thanks for coming by.