Monster if your being anal, to the point of being obsessive, about cleaning your K&N, your defeating the purpose of the oil on gauze type air filters. The added accumulation on the outer-part of the filter improves the ability of it to keep the smaller trash out. K&N even recommends 50 K between cleaning, see below. I cut and pasted it from K&N's own tech section.
4. How often do I need to clean my K&N air filter?
If you have not experienced a decrease in mileage or engine performance, chances are your filter is fine and does not yet need cleaning. To be more specific, the filter does not require cleaning if you can still see the wire screen on the entire air filter regardless of how dirty it may appear. When the screen is no longer visible some place on the filter, it is time to clean it. When used in normal paved road, street or highway conditions, our replacement air filters that fit in the factory air box should require cleaning every 50,000 miles and our large conical filters on an intake system should require cleaning every 100,000 miles. When used in dusty or off-road environments, our filters will require cleaning more often. We recommend that you visually inspect your filter once every 25,000 miles to determine if the screen is still visible.
2006 ZX-14
1984 ZX750E1