I have the Primal Produx seat covers and just got back from a week long camping trip at Lake Trinity, known for their red mud. After a week of camping and people tromping through the boat, the seats are as clean as before leaving. This even after having a few "non-boat savvy" people getting into the boat and not cleaning their feet very well prior to getting in.
I think they're one of the best investments I've made for my boat.
Chris
www.wakejunky.com