Remove burnt plastic from flat iron hair straightener plates with the following ways:
Try to peel the plastic off the affected plate.
Carefully apply acetone (nail polish remover) or rubbing alcohol to the plate.
Gently scrape off the plastic with a butter knife. Take care not to remove the plate's coating.
After removing the plastic you'll want to use a damp paper towel to wipe the flat iron's plates.
Hair stylists caution against using rubbing alcohol on ceramic plates as the alcohol may damage the plates.
To prolong the life of your flat iron hair straightener don't wrap the power cord around it. Store the styling tool with the cord loosely bundled next to it.
The Huffington Post offers tips on not letting your flat iron hair straightener ruin your hair.
Speaking of flat irons, researchers from the University of New Mexico and Los Alamos National Laboratories have invented one that can change natural hair color with the use of ion beam technologies. If you don't like the new color you can always wash it out. Find out more from the University of New Mexico.