Instructions
1
Remove the filter from your vehicle. Inspect the filter to determine which side is the dirtiest. Make a small mark on the plastic edge of the dirtiest side. Lightly tap the filter against the edge of a trash bin to shake out the large particles of dirt. If you are unsure about how to remove the air filter in your specific vehicle, consult your owner's manual.

2
Bring the  filter to a sink. Squirt  filter cleaning solution on the filter, and then run warm water over the filter. Continue running the water over the filter until the runoff is clear.

3
Let the  filter dry for about 24 hours. Do not place it in direct sunlight and do not use unnatural heat, such as a hair dryer.

4
Bring the filter back to the sink. Hold it over the sink and start oiling the filter. Squirt a line of S&B filter oil solution onto each filter pleat. Do this only on the side that you marked as the dirtiest. Let the filter sit for a few hours.

5
Inspect the filter for areas that aren't properly oiled. These areas will be white, while the properly oiled areas will be off-white from the oil. If there are areas that require more oil, add a small bit oil the  filter oil solution.

6
Re-insert the  filter into your car's filter compartment.