Dab or spray the stain on the satin fabric with club soda or a stain remover that doesn't contain bleach as soon as possible. If the stain is blood, soak the fabric in cold water before applying the stain remover.
Wipe the stain with a clean cloth to remove it.
Fill a clean sink with cold water and one cap full of Woolite or other mild detergent that doesn't contain bleach.
Soak the entire piece of fabric in the water for five minutes.
Turn the garment inside out, then agitate the fabric with your hands while it is soaking.
Pull the satin out of the sink to see if stain is gone. If not, scrub it gently with a soft-bristled brush and gentle dish soap. Rinse with cool water.
Lay the satin fabric on the thick towel. Roll the towel to squeeze water from the fabric.
Hang the satin fabric to dry. Make sure there are no heat sources near the fabric while it is drying or after it has dried. Heat breaks down satin fibers.