wow, you do everything that your not supposed to when cleaning a filter....
Brake cleaner will eat through the fine material in an air filter and render it useless. Mild soap and warm water is the best best, which is exactly what comes in the K&N kit. Don't use compressed air to dry because it can blow tiny holes into the filter that also renders is useless. When you do clean it, make sure to run the water from the inside out, that way you're not trying to push the dirt further into the filter. A filter designed to be oiled won't be effective if put back in dry, the filter media just isn't designed to capture particles without the oil. Like said before, go sparingly on the oil. It takes very little but is needed.