I wash mine every season in our front loader washing machine with Woolite, the manufacturer says not to use detergents. I also add a small amount of bleach to help clean the mildew that tends to build up on the underside. After hanging over the fence to dry I waterproof it with the spray tent and canvas waterproofing from Wal Mart. This process has worked well for several years and keeps the canvas looking new. I have tried the pressure washer method in the driveway in the past but find the washing machine works best.
