2. Lay the filter flat and spray it with a cleaning detergent(409, Fantastic, Rugged Red, Ivory Liquid, etc.) on one side and then the other until the filter is soaked with the detergent. The amount of detergent required will be dependent upon the amount and type of pollutants held in the filter.
3. Lay the filter with the "wash" arrow , or dirtiest side, down or prop at angle against fence or outside wall and flush the detergent from the filter using a garden hose with a nozzle set at the high pressure setting. If laying flat, a 1" or 2" object should be placed under one side of the filter frame to allow room for the water and dirt to escape. Turn the filter over and repeat the same procedure.
4. Perform steps 2 and 3 until the filter is clean. If the filter is extremely soiled, it may be more convenient to use a car wash facility to remove all embedded dirt from the filter. Always lay the filter flat when using high pressure water for cleaning.
5. Shake excess water out of the filter and allow it to drip dry to the extent that it can be carried without dripping water.