DO NOT MACHINE WASH!

Put cover on boat and hose down thoroughly. Once wet, squeeze dish detergent or clothing detergent on cover and scrub with cloth or non metal scrubbie depending on how dirty it is. You can scrub quite hard without injuring the cover. Hose down until it is clean and then remove boat and hang somewhere to dry. A picnic table works well or a boat trailer.
Paddle Covers are pretty much the same but don't try to clean the bag with the paddle inside.
Spray decks need to be hand washed with detergent and then hung to dry.

If you machine wash it will ruin the water proof backing on the fabric of both the paddle and boat bags as well as the spray decks.