I Saved this advice from years ago... don't remember who posted it.
Ok guys this came directly from the Fleetwood factory and it works.
Mix distilled water 50% with plain old household bleach, spray it on the stained area, let it sit for maybe 1 minute them blot with a absorbent towel. 75% to 80% of the water stains will come out with the first blotting. Repeat the process again and more will come out I had to do it three and four times to get it all. Don't saturate it just fog it.
Next fill your spray bottle with just distilled water and do the spray and blot routine a couple of times to rinse out the bleach.
Finally, mix 50% white vinegar and distilled water and spray it again and blot then just fog it and leave to dry.
One other thing, be sure you wear a mask as the over spray of bleach is real tough to take and the vinegar ain't much better.
If you want to see some B4 and after photos go to picasaweb.google.com/rchonly look in "Roger Photos" - "View Files" for my file entitled "1991 American Eagle - Water Damage". Don't let the date on those photo's fool you, my camera decided to default itself back to day one and I didn't notice it until those were published. I took those in May and have just finished the restoration of the Eagle about 10 days ago. I'll put up some new photos in about a week. I found me a jewel as it has 6,011 miles on it.
You will be surprised how fast this works and pleased with the end results.
Roger
11/21/2010
Before you try painting, mix plain old Clorox bleach & distilled water in a spray bottle at a 50% solution. Spray it on leave for about 30 to 45 seconds and wipe it off with an absorbent towel if it's going to work you'll see it right away. If it works keep applying that way until the stain is gone. Once the stain is gone spray a 50/50 mix of white vinegar and distilled water and wipe off a couple of times and you will have nuetralized the bleach, finally just spray and wipe with distilled water and it should be cured.
If that doesn't work go with the paint job.
OH YEAH, WEAR A DUST MASK WHEN YOU SPRAY THAT STUFF (the bleach & the vinegar) OVERHEAD IT IS REALLY NASTY TO BREATH.
Kathy