How to Clean Air Filter Car: Spray, Rinse, Dry and Oil
How to clean a car air filter with a cleaner and oil kit: spray, rinse, dry and re-oil, and which kit handles each step.
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How to clean air filter car filters? On a reusable oiled filter, spray on cleaner, rinse with water, let the filter dry, then apply fresh filter oil. That is the process the K&N kit lists, and it is the short answer to how to clean air filter car filters at home. This guide covers reusable oiled, foam and fabric filters, which are the filters the gear below is made for.
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Below: the cleaning steps in order, which kit suits which filter, and the gear that handles each step.
| # | Product | Shop Score | Buy |
|---|---|---|---|
| 1 |  K&N Air Filter Cleaning Kit | 9.6/10 | Buy on Amazon |
| 2 |  Maxima Racing Oils Air Filter Maintenance Aerosol | 9.6/10 | Buy on Amazon |
| 3 |  K&N Air Filter Oil: Aerosol | 9.5/10 | Buy on Amazon |
K&N Air Filter Cleaning Kit
A cleaner and oil kit for oiled K&N air filters, with Power Kleen degreaser and red filter oil, following the spray, rinse, dry and oil steps.
Pros
- Includes Power Kleen cleaner and red filter oil in the same kit
- Cleaner dissolves build-up and old oil for rinsing away with water
- Oil stays suspended in the pleats for contaminant capture
- States it restores air flow efficiency
Cons
- For oiled K&N air filters only, not every filter type
- No warranty stated in the listing
- No size or volume stated for the cleaner or the oil
- Drying time not stated
Maxima Racing Oils Air Filter Maintenance Aerosol
A pack of 2 aerosol maintenance kits for foam and fabric air filters, with industrial-strength, non-caustic cleaners that wash out with water.
Pros
- Formulated specifically to clean foam and fabric air filters
- Industrial-strength cleaners remove grease and heavy filter oils
- Non-caustic formulation washes out with water
- Pack of 2, and 52 state VOC compliant
Cons
- Cleaner only; no oiling step stated in the listing
- Warranty has no stated term
- No volume stated per can
- Made for foam and fabric filters, not oiled cotton filters
K&N Air Filter Oil: Aerosol
A 12.25 ounce aerosol of K&N red filter oil for re-oiling a cleaned oiled filter, which penetrates and saturates the pleats.
Pros
- Designed specifically for K&N air filters
- Penetrates and saturates filter pleats quickly
- Oil traps contaminants that reduce air flow efficiency
- 12.25 ounce aerosol, 347 g
Cons
- Oil only; no cleaner included
- Warranty reads limited with no term stated
- For oiled K&N filters only
- Covers only the oiling step of the cleaning process
How to clean air filter car filters, step by step
- Take the filter out of its housing. Work with the filter on a bench, so the cleaner and rinse water stay out of the intake.
- Spray on the cleaner. The K&N kit lists Power Kleen, a degreaser that dissolves filter build-up and old oil.
- Rinse with water. Rinse the grime away with water, as the K&N steps list, and let the water drain out of the filter.
- Allow the filter to dry. Let the filter dry before the next step, as the K&N steps list.
- Apply fresh filter oil, on an oiled filter. The K&N oil stays suspended in the pleats of the cotton filter material and traps contaminants that reduce air flow efficiency.
- Put the filter back in its housing. Refit the filter once it is dry, and oiled if yours is an oiled filter.
Which kit fits which filter:
| Kit | Made for | What it does |
|---|---|---|
| K&N Cleaning Kit | Oiled K&N air filters | Cleaner plus red filter oil; spray, rinse, dry, oil |
| K&N Filter Oil | Oiled K&N air filters | Fresh oil for the pleats after cleaning |
| Maxima Combo Kit | Foam and fabric air filters | Industrial-strength cleaners, washed out with water |
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What cleaning restores
Cleaning removes filter-clogging build-up, and the K&N kit states the result is renewed air flow efficiency, so the filter performs like new. The red filter oil remains suspended in the pleats of the cotton filter material, which lets the filter capture contaminants. The Maxima kit states its cleaners remove grease, heavy filter oils and other contaminants, and that its non-caustic formulation washes out with water.
Oil matters after cleaning
The oil is part of the process on an oiled filter: the K&N oil is formulated to improve air filter performance and it penetrates and saturates the pleats, trapping contaminants that reduce air flow efficiency. On an oiled K&N filter, cleaning without fresh oil leaves the pleats without the oil that traps contaminants, per the K&N listing.
Gear for the cleaning steps
The cleaner lifts the build-up, the rinse washes it out, and fresh oil re-coats the pleats of an oiled filter, so each kit below covers a step in the process above.
FAQ: garage tools
Can I clean a car air filter with water?
Yes, on the filters in this guide. The K&N steps list rinsing with water after spraying on Power Kleen, and the Maxima kit states its non-caustic formulation washes out with water. On an oiled filter, let it dry before you apply fresh oil.
Do I need to oil the filter after cleaning?
Yes, on an oiled filter. The K&N steps end with applying fresh filter oil, and the oil remains suspended in the pleats to trap contaminants. The Maxima kit is a cleaner for foam and fabric filters and does not state an oiling step.
Can I use the K&N kit on any air filter?
No. The K&N kit states it cleans all oiled K&N air filters, and the oil is designed specifically for K&N air filters. For foam and fabric filters, the Maxima kit states it is formulated specifically to clean them.
Does cleaning restore a filter to like new?
That is the maker’s claim for the K&N kit: it states cleaning restores air flow efficiency so the filter performs like new. Cleaning removes build-up and old oil, and the K&N kit states the result is renewed air flow efficiency.
What is in the K&N cleaning kit?
The kit includes Power Kleen filter cleaner and K&N red filter oil. The cleaner dissolves build-up and old oil, and the oil stays suspended in the pleats of the cotton filter material for contaminant capture.
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