When we got our Duvalays last year I idly suggested to SWMBO that we remove the covers to wash after every trip.
Her reply was we would leave them on until the end of the season and then wash them ready for the following year.
Boy am I glad she did.
I spent a good hour yesterday afternoon trying to shoehorn the mattress and quilt into two Duvalays,they are like a chinese puzzle.
I did it eventually but you have been warned.
Then again I have trouble with quilt covers as well.