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Of course K&N is going to downplay the oil penetration. People who understand very little about cars would be terrified to think they were sending "oil into my engine!". The fact is, that the volume and velocity of air passing through the gauze medium (trapped within the wire mesh is sufficient to blow small particles of oil into the MAF and intake. If you want to test this, place a sheet of clean white paper behind it and simply spray the filter with compressed air when it is coated with oil. Then check the paper.
The point is, the amount of oil that enters the MAF is minimal as long as you: A) Don't load the filter up with excessive oil once you've cleaned it. and B) allow sufficient time for the damp oil to dry a bit before putting the filter in the car and driving it.
As for cleaning, the kit comes with both the cleaner and the oil. We first remove any loose dirt with a disposable chip brush. Then we spray on the cleaner and allow it some time to penetrate and loosen the dirt. The filter is then rinsed gently with a garden hose (rinse from the upper surface (intake side) so that dirt exits the lower surface). We then shake out the excess water and allow the filter to fully air dry in the sun before spraying a light coat of the oil on the lower surface of the filter. We then invert the filter to allow the oil to soak in. Then any excess is gently wiped off and the filter is allowed to dry. We've done this at least 30 times in the last 7 years. It works.
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