Use a piece of !00% cotton, dish towel, white t-shirt - not a towel with terry loops on it. Dampen lightly with white vinegar. Place of the shiny spots and press with you med. hot iron.
If the future, use a pressing clothe or cotton (not terry) dishtowel between fabric and iron or iron inside out, or use a cooler iron.
Pat - Seamstress in Sherburne NY, February 2010