Here's what I found on Ehow.com you can check it out for yourself if you'd like. If the documents are worth money or just sentiment you may want to take them to a professional.
1Lay the paper out flat, or as flat as possible, on a hard surface. In order to remove the stains, you need to have as few wrinkles and ridges in the paper as possible.
2Lightly dust palpable clay or chalk over the stain using the soft paintbrush. These two components will draw the moisture out of the paper to diminish the stain. Only apply the powdered substance to the stained areas, and use enough to cover the stain completely.
3Place the stained paper gently between two pieces of fresh, white paper. These sheets will act as a pocket for the stained document so it will not burn when you apply heat to help lift the stain.
4Lay the flat-iron over the top paper for about five to 10 seconds. Remove the flat-iron before the paper scorches.
5Remove the stained paper from the inside of the pocket, and the stain should be extremely lightened or completely removed.
1Lay the paper onto a flat, hard surface. Smooth out all edges and creases. This technique will only work if the paper is as flat and wrinkle-free as possible.
2Tape the paper down using regular tape to keep it in place.
3Fill the spray bottle with water, and lightly mist the stained area on the paper. Do not soak the stain. Making it just damp enough for the water to be removed by suction is your goal.
4Turn the vacuum on, and place the hose nozzle directly above the stain, without touching the paper. Adjust the vacuum strength if it has adjustable settings.
5Watch the moisture and stain lift off of the paper.
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