I don't use mine, and because I use the bag to carry things, it's sitting in a ball downstairs. Based on the size, the big commercial washer at any laundromat would do.
Mine is still in its shrink-wrap. I use a very nice California Car Cover on mine...and it washes very nicely in cold water in my washing machine, and dries nicely using either low heat or ambient air.
I was thinking it would get through a large washer (your home washer is probably not big enough) but I was worried about the plastic window and would not put it in a dryer.
I have washed my OEM cover a few times with excellent results. There is a laundromat with big commercial machines on the corner of Orange Grove and Thornydale in Tucson. I washed with liquid (clear) detergent, then air dried stretched out..no dryer!