what kind of stain, how big a stain, on what color curtains? sometimes stains can be removed with hydrogen peroxide...google it and you'll find lots of info on that. sometimes dyeing can cover a stain or at least lessen its appearance if you do it the right color. you can also 'craft' over a stain depending on size and location. you'll have to give more info to get a better idea of options
2007 25' Classic
1993 21' Sovereign
Join Date: Apr 2004
Water stains can be removed with Oxi Clean.
I had the same water stain problems on my '93 21ft. Sovereign. I hand washed the drapes in a bucket using Oxi Clean. A toothbrush is great for working in the Oxi Clean directly on the stained areas. Rinse in clear water and let them drip dry on a clothes line. My window coverings looked like new. Understand, this worked with my '93 fabric. Whether your window coverings are made of similar material is an unknown.
I don't think they are water stains they look more like light brown sun stains. They are located in front of the rear window. My Airstream has been stored under a cover it's entire life and shows no sign of any leaks.