Yes, I use one, but for the motorhome, not the Mav. It’s so easy to soap it up and use a long hand brush. The Mav is hand washed the old fashioned way.
Mine did that when I first got it. It was horrible. Had to use a USB thumb drive and upgrade the Sync 3 to the latest version. Not sure if yours has Sync 3 or the new Sync 4.