What is the difference between protein soot and synthetic soot, and why does it change how cleanup is done?

“Protein soot comes from burning organic material — food, grease, natural fibers — and deposits as a nearly invisible, extremely adhesive film that carries an intense odor. Synthetic soot from burning plastics, foam, and carpeting is thick, oily, and highly acidic, capable of etching metal and discoloring surfaces within hours.”