Just thought that I would give you all a demo of the Pro Clean Filter Kit. I know that a few of you have bought them and they are are completely re-usable countless times over. The kit consists of 1 large 20lt Bucket with a dirt separation grate, 1 smaller 5ltr Bucket, 5ltrs of Pro-Filter cleaning solution and one pair of Nitrile Gloves.
Pour the entire contents of Pro-Filter into the large 20ltr bucket and submerse filter, dirty side down, and squeeze out dirt and old filter oil. Then place a splash of pro cleaning solution into the smaller bucket and half fill with warm water. submerse filter and sqeeze all excess Pro-Filter solution out then allow to air dry. Then re-oil with your favourite filter oil.
Here is a dirty air filter before using the Pro Filter Cleaning Kit

After using the Pro Filter Cleaning Kit
