I called Winnebago about our blinds and they said they had to be dry cleaned. When I found out the price, I moved onto plan B. To get the blinds off, I had to drill out two rivets that secured a small plate that prevents the blinds from sliding off the track. There is a small plate on each side (above the side windows that are adjacent to the front seats). Once removed, I hand washed the blinds in the kitchen sink with dish detergant. Much to my surprise, they cleaned up perfectly and are even softer than when they were new. I re-installed them when they were slightly damp. I put the little plates back in with sheet metal screws (to replace the rivets) That way, when I need to clean them again, I'll simply take out the screws. I know this approach bucks conventional wisdom but it works great and it's free. Hope this helps.
2004 Winnebago Brave 34D with the usual add-ons