I wash mine with dish soap and water and rinse it out real well. Then I squueze as much water out of it as possible and let it air dry for a day, then hit it with a blowdryer if it still feels a little damp. Then I do the ziploc bag and filter oil. I also keep a spare set of motorsaver foams cleaned, oiled, and ready to go. The foams are cheap, around $4 for a set of inner and outer filter.