Clean the aftermarket air filter under the hood in your 2005-2006 Jeep Liberty 2.8L CRD with a Filter Cleaning Kit. Aftermarket filters are dry or oiled and feature a synthetic or cotton gauze filter media. Manufacturers such as S&B Filters, AFE, K&N Engineering, and others produce Filter Cleaning Kits that are available at XDP. To find the right match for your existing air filter, choose the filter brand and media type to ensure you get the right cleaning kit. Cleaning your reusable air filter often is crucial when it comes to getting the most life out of your drop-in, or cone air filter.