I have washed mine a few times now. I have the older grey one, original to my 2003. I wash mine about once every 2 years, depending on the amount of dust that settles on it during winter storage. Not used in the summer. Boat is garage kept, and trailered to landing. I use regular detergent, and the biggest machine at the laundry mat. Its the only item I put in. I do partially dry in a dryer on MED. It get tangled up on itself pretty bad in the dryer, have to pause and pull open. Then lay out on clean floor to finish dry. No waterproofing left in it after all the years, but that is not a concern for me.